(a) What is the fundamental difference in the electronic configurations between the group 1 and group 2 elements?
(b) On the basis of electronic configuration, how will you identify?
(i) Chemically similar elements?
(ii) The first element of a period?
(a) Group 1 elements have 1 valence electron in their atoms whereas group 2 elements have 2 valence electrons in their atoms.
Example: Lithium, sodium on group 1 have valency 1, Beryllium and magnesium have valency 2 belongs to group 2.
(b) (i) All the chemically similar elements will have the same number of valence electrons.
(ii) The first element of every period has 1 valence electron. Thus, it is determined by the number of valence electrons in its atom.
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