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an element has 2 electrons in its N shell it reacts with a non metal of atomic number 7 the compound formed reacts with water and produces a basic gas.identify the elements and write the balanced chemical reactions |
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Answer» Answer: first element is Calium and the other element is nitrogen Explanation: an element which has 2 electrons in its N shells clearly INDICATES that its K, L and M shells are completely filled which means 2 ( electrons in K shell) + 8 ( electrons in L shell) + 8 ( electrons in M shell) + 2 ( electrons in N shell which is already given in ques. ) = 20 we know 20 is the ATOMIC no. of calcium therefore first element is calcium Nitrogen has atomic number '7' and it is also a non-metal. therefore another element is nitrogen when calcium and nitrogen reacts, I they FORM calcium NITRIDE 3Ca (s) + N2 (g) ----> Ca3N2
when this compound reacts with water it gives calcium hydroxide and ammonia Ca3N2 + 6H2O ---> 3Ca(OH)2 + 2NH here ammonia is the basic gas mentioned in the question |
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