1. Two elements X and Y belong to group 2 and group 17. The molecular formula of the compound
when X combines with Y is _____.?
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Answer:
it becomes hydrogen
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Answer:
Two elements X and Y belong to Groups 1 and 2 respectively in the same period of the Periodic Table. Compare these elements with respect to :
(i) Number of electrons in their outer-most orbit.
(ii) Their atomic size and their valencies.
(iii) Their ionisation energy and metallic character.
(iv) Formulae of their chlorides and sulphates.
Explanation:
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