# which group 1 element reacts the most vigorously?

म्यूजिक कंसर्ट्स के लिए बनी हॉल की दीवारों को ध्वनि का अवशोषण करना चाहिए. K. Li. Ba. The Group 1 elements in the periodic table are known as the alkali metals. Thanks Comments; Report Log in to add a comment Looking for something else? […], Q.भारतीय संविधान को अर्ध संघीय क्यूँ कहा जाता है ? Reactions with dilute hydrochloric acid. इन्हीं में से एक पटना कलम या पटना शैली भी है . Looking for something else? Explore answers and all related questions . Which group 1 element reacts the most vigorously? and WHY? So it is almost impossible to store it in pure form.and caesium is the most reactive metal. I'll assume your talking about a vigorous reaction and not just an oxidation that most metals will undergo in water. Q 35. Feb 5, 2014 . Which reacts the most vigorously? 1. Cs. B. high melting point and reacts vigorously with water. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. As they are in the same group, they have similar chemical properties and will react with substances (including water) in a similar way. Therefore, Cs will be most likely to react. How do they react with iodine? Group I: Group I or IA (or Group 1) on the periodic table is known as the alkali metals. Sodium (N a) C. Potassium (K) D. Rubidium (R b) Answer . Which of the hydrogen halide acids is used to etch glass? In each case, a solution of the metal hydroxide is produced together with hydrogen gas. Click hereto get an answer to your question ️ Alkali metal (M, group 1 ) react with water to form an aqueous alkali metal hydroxide (MOH) and hydrogen gas as shown by the general equation below: 2M(s) + 2H2O → 2MOH(aq) + H2(g) Which element would react most rapidly with water? 2. General. Looking for something else? In each case, a solution of the metal hydroxide is produced together with hydrogen gas. Beryllium : Beryllium is a chemical element with the symbol Be and atomic number 4. A. Lithium (L i) B. It uses these reactions to explore the trend in reactivity in Group 1. I think that it helps to imagine reactions as sort of a "fight" between elements over electrons. Cesium reacts most vigorously with water because it is an alkali metal or a Group I element. Explore answers and all related questions . Fluorine is the most reactive non radioactive element on periodic table. Help. Which element in the group is the most metallic in character? alkaline earth metals noble gases alkali metals halogens. How do they react with iodine? Feb 5, 2014 . फलतः चित्रकला विभिन्न क्षेत्रीय रूपों में भी विकसित हुई. Feb 5, 2014 . These group 1 elements only have one electron which is very easily lost to form a cation. C. low melting point and reacts vigorously with water. III. The outer e- is lost very easily. A bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal. Your IP: 185.2.4.95 Looking for something else? hydrogen gas is released no reaction How do they react with oxygen? See your other post. Q 34. It is primarily used as a hardening agent in alloys, most notably beryllium copper. no reaction. Pieces of it explode in water with increasing intensity going down the group. It is primarily used as a hardening agent in alloys, most notably beryllium copper. hydrogen gas is released. 1 Answer. B. chlorine and potassium. What happens when the elements in group 1 react with water? Which group 1 element reacts the most vigorously? Relevance. Feb 5, 2014 . Thanks Comments; Report Log in to add a comment Looking for something else? I would look in a text for periodic trends and find my answer there. You're right; the best answer is B. Chlorine atoms are smaller than iodine atoms and. DrBob222. Water: All of the group 2 elements form hydroxides when reacted … Salts can consist of hydrogen. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. The group 1 elements in the periodic table are known as the alkali metals. How do they react with Bromine? Rb Cs K Li Na 1 See answer Answer 2. hudebya +1 cliffffy4h and 1 other learned from this answer Answer: The answer is lithium(LI) 0.0 0 votes 0 votes Rate! The general formula for this reaction is MO (where M is the group 2 element). A)Li B)K C)Cs D)Na E)Rb. All of the elements in group 2 react vigorously with Oxygen, the product of which is an ionic oxide. It uses these reactions to explore the trend in reactivity in Group 1. The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group. I an oxide is formed (M_2O) an oxide is formed (MO) no reaction Which reacts the most vigorously? You may need to download version 2.0 now from the Chrome Web Store. How do they react with oxygen? Alkali metals need to be stored under oil to prevent them reacting with the oxygen and water vapor in the air. The Group 1 elements in the periodic table are known as the alkali metals. Beryllium : Beryllium is a chemical element with the symbol Be and atomic number 4. Cloudflare Ray ID: 61037ece78804077 so in this case, Cl2 is more reactive because it is further UP the group. Copyright © 2018 IasHindi. Feb 5, 2014 . परिक्षण कीजिए प्रस्तावना भारतीय संविधान मेँ संघीय सरकार का प्रावधान है। एकल सरकार मेँ सभी शक्तियाँ केंद्र सरकार मेँ निहित होती हैं और राज्य सरकारें केंद्र सरकार से अपने अधिकार प्राप्त करती हैं। संघीय सरकार में संविधान के माध्यम से सभी शक्तियाँ केंद्र सरकार (राष्ट्रीय […], केन्द्रीय सांख्यिकी कार्यालय (CSO) ने हाल ही में 2019-20 के लिए सकल घरेलु उत्पाद के प्रथम अग्रिम अनुमान जारी किये। CSO के अनुमान के अनुसार मौजूदा वित्त वर्ष में भारत की जीडीपी विकास दर 5% रहने का अनुमान है। यह अनुमान पिछले दो तिमाहियों पर आधारित है। 2018-19 में जीडीपी विकास दर 6.8% रही थी। […], भारत में जनगणना और राष्ट्रीय जनसंख्या रजिस्टर (एनपीआर) को अपडेट करने की प्रक्रिया शुरू होने जा रही है, जिसमें प्रत्येक व्यक्ति का विवरण होगा। जनगणना और एनपीआर में बहुत ज्यादा अंतर नहीं है। आइए समझते हैं दोनों की विशेषताएं, मकसद और अंतर क्या है और किस कानून के तहत ये प्रक्रियाएं पूरी की जाती हैं। […], पटना कलम मुगल साम्राज्य के पतन के काल में शाही दरबार में कलाकारों को प्रशय ना मिलने के कारण इनका पलायन अन्य क्षेत्रों में होने लगा था. The table shows observations when lithium, sodium and potassium are added to water. What group of elements are the most reactive metals? They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. The reason is that potassium and sodium both lie in Group 1 of the periodic table, which contains all the alkali metals. All of Group 1 elements —lithium, sodium, potassium, rubidium and cesium react vigorously or even explosively with cold water. Which alkaline earth metal reacts the most vigorously with water at room temperature? Ca Sr Be Ba. Which of the following metals is expected to have the fastest reaction with water? A. hydrogen gas is released B. no reaction. • बिहार दरोगा मुख्य परीक्षा के लिए महत्वपूर्ण टॉपिक, CSO ने GDPके प्रथम अग्रिम अनुमान जारी किये. Calcium and magnesium are in Group 2, known as the alkaline earth metals. Lithium sodium and potassium all react vigorously with water. Cs. Group 2 The Alkaline Earth Metals. All Rights Reserved. Group 1 and 17. In each case, a metal halide is formed (fluoride, chloride, bromide or iodide). K. Li. This page discusses the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and cesium. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Because Li is the strongest reducing agent of the alkali metals, it reacts most quickly with water of the alkali metals. Another way to prevent getting this page in the future is to use Privacy Pass. IV. The Facts. A. chlorine and lithium. Those are less reactive than alkali metals. Which group 1 element reacts the most vigorously? They are the most reactive metals on the periodic table. For the most part, Group 14 elements do not react with water. B. high melting point and reacts vigorously with water. A salt is formed MBr2 B. This page looks at the reactions of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium - with water. All of these metals react vigorously or even explosively with cold water. All of the group one elements (sodium & potassium etc) and most of the group two elements (calcium etc) will react vigorously and spontaneously in hot water. An oxide is formed (M_2 O) an oxide is formed (MO) Which reacts the most vigorously? Rb. Oxygen reacts rapidly with Group 1 elements. Question 33. Flame tests are used to identify alkali metal ions in compounds. The reactivity of the alkali metals increases down the group. Which element would react most rapidly with water? share | improve this answer | follow | answered Jun 17 '16 at 4:09. user24511 user24511. C. low melting point and reacts vigorously with water. sorry, didn't mean to post twice lol computer glitched XD Help. A. an oxide is formed M2O B. an oxide is formed MO C. No reaction Which reacts the most vigorously? (A) Li (B) K (C) Rb (D) Na. How do they react with oxygen? How do they react with oxygen? The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). New questions in Chemistry. Which element in the group is the most metallic in character? These elements include lithium, potassium, calcium, sodium, magnesium, aluminum, zinc, iron and lead. the trend in the non-metal section is that element become more reactive as you move UP a group. Metals to the right of hydrogen in the electrochemical series, such as copper, silver and gold, do not react. It exists in gaseous form at room temperature and even reacts with glass. All of the group one elements (sodium & potassium etc) and most of the group two elements (calcium etc) will react vigorously and spontaneously in hot water. This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with common acids. • New questions in Chemistry. One interesting consequence of this is that tin (Sn) is often sprayed as a protective layer on iron cans to prevent the can from corroding. They include lithium, sodium and potassium, which all react vigorously with air and water. Multiple Choice . Question 33. Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). In each case, the aqueous metal hydroxide and hydrogen gas are produced, as shown: (1) 2 X (s) + 2 H 2 O (l) → 2 X O H (a q) + H 2 (g) where X is any Group 1 metal. So it is almost impossible to store it in pure form.and caesium is the most reactive metal. How do they react with water? It is likely to be a metal which has a A. high melting point and reacts slowly with water. Who will win the fight and how it will go is determined by the number of protons in … Hence chlorine and potassium will react more violently. सामान्य ताप व दाब पर वायु में ध्वनि का वेग लगभग 332 मीटर प्रति सेकंड होता है. Which reacts the most vigorously? a salt is formed (MBr_2) a salt is formed (MBr) no reaction How do they react with water? Joe. 0 0 501; Stacy. The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table - they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen. Rate! halogens. an oxide is formed with the general formula M2O. Which Element In The Group Exhibits Slightly Different Chemistry From The Others? How do they react with iodine? A)Al B)Li C)Ba D)Mg E)Cs. Metals to the left of hydrogen in the electrochemical series react with hydrochloric acid. Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). (Total 1 mark) 6. Secondly, which group 1 element reacts the most vigorously? All alkali metal oxides form basic solutions when dissolved in water. A. A sample of pure lithium carbonate contains 18.8 % lithium by mass. • 75.2 % B. hydrogen gas is released oxygen is released How do they react with oxygen? If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. a salt is formed (MI_2) a salt is formed (MI) no reaction How do they react with water? ध्वनि तरंगे निर्वात में नहीं चल सकती है. Which element reacts most vigorously with water? Group 1 elements (the alkali metals) all have one electron i n their outer shell. Feb 5, 2014 . Group 14: Carbon Family. It is likely to be a metal which has a. As they are in the same group, they have similar chemical properties and will react with substances (including water) in a similar way. इस चित्र कला के विकास का युग […], Surendra: Sir notes bejo mere whatsapp number 9680280259 HCl HI HBr HF. A salt is formed MBr C. No reaction How do they react with water? A. Find more answers. It is likely to be a metal which has a. Which group 1 element reacts the most vigorously? The group 1 elements react with oxygen from the air to make metal oxides. Figure: An empty tin can. A. high melting point and reacts slowly with water. General. How do they react with water? For example, Magnesium reacts with Oxygen to form Magnesium Oxide the formula for which is: 2Mg (s) + O 2 (g) 2MgO (s) This is a redox reaction. – 3 लाख रुपये […], 2020 तक, किस राज्य ने महात्मा गांधी राष्ट्रीय ग्रामीण रोजगार गारंटी योजना (MGNREGS) के तहत सबसे ज्यादा श्रमिकों को रोजगार प्रदान किया है – छत्तीसगढ़ हाल ही में सुर्ख़ियों में रहे टी.एस. Quiz 21: Chemistry of the Main-Group Metals; Which Element Reacts Most Vigorously with Water? A. noble gases B. alkali metals C. alkaline earth metals D. halogens. As far as the elements are placed in periodic table, the more violently they reacts to each other. All the alkali metals react vigorously with halogens to produce salts, the most industrially important of which are NaCl and KCl. 9.40 % C. 37.6 % D. 18.8 % In each case, the aqueous metal hydroxide and hydrogen gas are produced, as shown: $2X (s) + 2H_2O (l) \rightarrow 2XOH (aq) + H_2 (g)$ where $$X$$ is any Group 1 metal. Help. The Group 1 elements in the periodic table are known as the alkali metals. It is likely to be a metal which has a A. high melting point and reacts slowly with water. AIEEE 2012: Which one of the following will react most vigorously with water? B. high melting point and reacts vigorously with water. 6 years ago . C. low melting point and reacts vigorously with water. A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. HF. Answer. What happens when the elements in group 1 react with oxygen? Steel cans are made of tinplate (tin-coated steel) or of tin-free steel. no reaction. Answer Save. How do they react with bromine? Group 1 alkali metals react with water vigorously and sometimes explosively. a salt is formed (MI_2) a salt is formed (MI) no reaction How do they react with water? Q 34. Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. The table summarises the names and formulae for the metal halides formed by the reaction of group 1 elements with group 7 elements. C. low melting point and reacts vigorously with water. Try be a little more specific next time. – 15% अल्पकालिक फसली ऋण की सीमा क्या है, जिसके लिए प्रतिवर्ष Interest Subvention Scheme के तहत दो प्रतिशत प्रतिवर्ष का उपदान प्रदान दिया जाता है? (Total 1 mark) 6. Ok so, the answer is B...but why? No reaction How do they react with oxygen? A sample of Chlorine occupies 8.50 L at 80.0 C and 740 mm Hg. Group 1 and group 7 elements doesn't react together. New questions in Chemistry. The group 3A elements are all metals. Group 1: The Alkali Metals. अतः आप इतिहास की तैयारी के लिए […], क्षेत्रीय व्यापक आर्थिक भागीदारी (RCEP) से भारत के बाहर निकलने के कारण तथा इससे आने वाली चुनौतियों का विश्लेषण कीजिए भूमिका क्षेत्रीय व्यापक आर्थिक साझेदारी (RCEP) एक व्यापक क्षेत्रीय आर्थिक समझौता है। इसका उद्देश्य आसियान और इसके मुक्त व्यापार समझौते (FTA) के भागीदार सदस्यों के बीच व्यापार नियमों को उदार एवं सरल बनाना है।समझौते के […], CURRENT AFFAIRS APRIL 2020 भारतीय रिज़र्व बैंक की अधिसूचना के अनुसार, कॉर्पोरेट बॉन्ड में विदेशी पोर्टफोलियो निवेशकों (FPI) के निवेश की नई सीमा क्या है? 1 decade ago. What happens when the elements in group 1 react with water? Lv 7. Group 1 Group 2 Group 3-12 Group 15 Group 16 Group 17 Group 18 . Which two elements react most vigorously with each other? Multiple Choice . Sections below cover the trends in atomic radius, first ionization energy, electronegativity, melting and boiling points, and density. All of these metals react vigorously or even explosively with cold water. Which element in the group is the most metallic in character? Which reacts the most vigorously? What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample? The Group 1 elements in the periodic table are known as the alkali metals. What happens when the elements in group 1 react with oxygen? Potassium belongs to group 1 and chlorine belongs to group 2. Rubidium is an element in the same group of the periodic table as lithium and sodium. – संयुक्त राष्ट्र नेशनल काउंसिल फॉर साइंस […], राष्ट्रवाद जवाहर लाल नेहरू आधुनिक भारत के सर्वाधिक प्रभावशाली व्यक्तियों में से एक थे। नेहरू ने भारत की सामाजिक-आर्थिक तथा राजनीतिक चिंतन प्रक्रिया एवं कार्यक्रमों को गहरे रूप में प्रभावित किया। ‘गहन राष्ट्रवाद’ नेहरू के उस वैचारिक दृष्टिकोण का अभिन्न अंग था, जो राष्ट्रीय आंदोलन के मंथन से उत्पन्न हुआ था। प्रखर अंतरराष्ट्रीयतावादी होने के […], महत्वपूर्ण तथ्य ध्वनि की गति ठोस में सर्वाधिक होती है जबकि गैसों में न्यूनतम होती है. It forms an ionic bond when the anions and cations form a 3D fixed lattice. Secondly, which group 1 element reacts the most vigorously? from Wikipedia. Performance & security by Cloudflare, Please complete the security check to access. Bubbles of hydrogen gas are given off, and a white precipitate (of calcium hydroxide) is formed, together with an alkaline solution (also of calcium hydroxide - calcium hydroxide is slightly soluble). तिरुमूर्ति को किस वैश्विक संगठन के लिए भारत का अगला स्थायी प्रतिनिधि नियुक्त किया गया है? A bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal. A. high melting point and reacts slowly with water. Group 1 Group 2 Group 3-12 Group 15 Group 16 Group 17 Group 18 . All of Group 1 elements—lithium, sodium, potassium, rubidium and cesium react vigorously or even explosively with cold water. 1 $\endgroup$ $\begingroup$ Welcome to Chemistry.SE! 1 0. Reactions with Group 1 Elements. Calcium, for example, reacts fairly vigorously with cold water in an exothermic reaction. How do they react with water? Favorite Answer. (Total 1 mark) 6. Which element reacts most vigorously with water? Answer the following questions about the characteristics of the elements in Group 2 (the alkaline How do they react with iodine? Rate! Reginald. Which group of elements are found as diatomic molecules? 0 0; DrBob222. (Potassium actually is the more reactive of the two) The reason is that potassium and sodium both lie in Group 1 of the periodic table, which contains all the alkali metals. an oxide is formed with the general formula MO. Find more answers. How do they react with iodine? Expert Answer 100% (45 ratings) Previous question Next question Transcribed Image Text from this Question. It exists in gaseous form at room temperature and even reacts with glass. Rb Cs K Li Na 1 See answer Answer 2. hudebya +1 cliffffy4h and 1 other learned from this answer Answer: The answer is lithium(LI) 0.0 0 votes 0 votes Rate! Answer the following questions about the characteristics of the elements in Group 2 (the alkaline How do they react with iodine? Quiz 21: Chemistry of the Main-Group Metals; Which Element Reacts Most Vigorously with Water? An oxide is formed (M_2 O) an oxide is formed (MO) Which reacts the most vigorously? (Potassium actually is the more reactive of the two) The reason is that potassium and sodium both lie in Group 1 of the periodic table, which contains all the alkali metals. At room temperature, oxygen reacts with the surface of the metal. (Zeff is lower). The Facts. This forms a white oxide, which covers the surface. How Do They React With Oxygen? Rb. Q 35. All the metals react with dilute hydrochloric acid to give bubbles of hydrogen and a colourless solution of the metal chloride. hydrogen gas is released oxygen is released How do they react with oxygen? All the alkali metals react with water, with the heavier alkali metals reacting more vigorously than the lighter ones. Reactions with dilute hydrochloric acid Each metal reacts with dilute hydrochloric acid, producing bubbles of hydrogen gas and a colorless solution of the metal chloride: Any element in the first column (Group 1) of the periodic table will react violently with water. share | improve this answer | follow | answered Jun 17 '16 at 4:09. user24511 user24511. B. high melting point and reacts vigorously with water. Fluorine is the most reactive non radioactive element on periodic table. How do they react with water? Notice that the reactivity of these metals increases going down the group. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. A)Li B)K C)Cs D)Na E)Rb. Strontium and barium have reactivities similar to lithium in Group 1 of the Periodic Table. an oxide is formed with the general formula M2O. Related questions. Which of the following metals is expected to have the fastest reaction with water? Which Reacts The Most Vigorously? Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. For example, with careful control of oxygen, the oxide M 2 O (where M represents any alkali metal) can be formed with any of the alkali metals. In their standard states, Group IA elements are solid (ignore hydrogen, its a total oddball in the table) and known as alkali metals Na(s). Which group of elements reacts violently with water? K. Li. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Na The further left an element is on the periodic table, the more reactive it is with water. C. iodine and lithium. This page looks at the reactions of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium - with water. How Do They React With Water? The principal combustion product is the most stable product with respect to the reactants. Show transcribed image text. See the answer. This means that the alkali metals all have similar chemical properties. Chemistry. Which reacts the most vigorously? (Total 1 mark) 6. Related questions. Which element in the . Group 2 The Alkaline Earth Metals. A: Electronegativity decrease across a period. This page discusses the reactions of the Group 2 elements (beryllium, magnesium, calcium, strontium and barium) with common acids. 1 $\endgroup$ $\begingroup$ Welcome to Chemistry.SE! Rubidium is an element in the same group of the periodic table as lithium and sodium. Rubidium is an element in the same group of the periodic table as lithium and sodium. Francium is element number 87 on the periodic table. The Group 1 elements in the periodic table are known as the alkali metals. This problem has been solved! Please enable Cookies and reload the page. Li and K are in group 1 - so the most reactive element of these two would be K because it's further DOWN the group. Na surendr, Anand Singh Thakur: Thank U very much dear, हिंदी - आईएएस , संघ लोक सेवा आयोग व विभिन्न राज्य लोक सेवाओं की तैयारी करने वाले अभ्यर्थियों को हिंदी में सामान्य अध्ययन व समसामयिक पर अध्ययन सामग्री प्रदान करता है |. an oxide is formed with the general formula MO. The group 7 elements react vigorously with group 1 elements such as sodium and potassium. II Alkaline earth metals react less vigorously with water than do the alkali metals. The reactivity of the alkali metals increases down the group. A)Al B)Li C)Ba D)Mg E)Cs. D. iodine and potassium. Subsequently, one may also ask, which element in group 2 is most metallic in character? Rubidium is an element in the same group of the periodic table as lithium and sodium. As a result, group I elements will always react more vigorously with water than group II will. Cl2 and Br2 are also in the same group (group 7). How do they react with oxygen? Answer the following about the characteristics of the elements in Group 1(the alkali metals). Group 1The first vertical column or group, Group 1, the alkali metals, has the most elements in it (7, if hydrogen is included). Which two elements react vigorously with each other? hydrogen gas is released. Caesium, the fifth alkali metal, is the most reactive of all the metals. sorry, didn't mean to post twice lol computer glitched XD Help. no reaction. Check Answer and Solution for above Chemistr Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). Group 1 elements (the alkali metals) all have one electron i n their outer shell. This reaction produces a metal hydroxide and hydrogen gas. Also the reactivity in metals increases on moving down the group while that of non-metals decreases on moving down the group. Feb 5, 2014 . Subsequently, one may also ask, which element in group 2 is most metallic in character? Hydrogen- a group 1 element, reacts really well with fluorine- a group 7 element. बिहार दरोगा मुख्य परीक्षा के लिए महत्वपूर्ण टॉपिक बिहार दरोगा मुख्य परीक्षा से पूर्व निम्न महत्वपूर्ण टॉपिक को अवश्य पढ़े— इतिहास – इतिहास विषय से मुख्य परीक्षा में लगभग 20 प्रश्न पूछे जाते है.ये सभी प्रश्न विगत वर्षों में विभिन्न प्रतियोगी परीक्षाओं में पूछे गए प्रश्न रहते है. Atoms of group 1 elements all have one electron in their outer shell. 1. 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