The elements 4Be, 12Mg and 20Ca each having two valence electrons in their valence shells are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions.a) In which group should they be?b) Which one of these is least reactive ?c) Which one of them has the largest atomic size?

The elements 4Be, 12Mg and 20Ca each having two valence electrons in

1.	The elements 4Be, 12Mg and 20Ca each having two valence electrons in their valence shells are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions.a) In which group should they be?b) Which one of these is least reactive ?c) Which one of them has the largest atomic size?
Answer» a) These have valency of 2 and so they should be in Group II. b) ₄Be is least reactive as reactivity. Increases down a group. c) ₂₀Ca has largest atomic size as size increases down a group.

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