Question

Answer the above question

Answer 1

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(i) The electronic configuration of Ca is 2,8,8,2.
Since the outermost shell contains two electrons, there are 2 valence electrons.

(ii) The electronic configuration of Na is 2,8,1. This shows that Na has 3 shells.

(iii) As one goes down the group, atomic size increases due to addition of shells.
Be<Mg<Ca<Sr

(iv) As one goes across a period, atomic size decreases due to attractive forces between electrons and the nucleus.

Na and Mg are bigger than Li and Be due to additional shells. However, Na is the biggest.

(v) Electronic configuration of K is 2,8,8,1

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