The electronic configurations of elements A, B, C and D are
A - 1s2 2s2 2p6
B - 1s2 2s2 2p6 3s2 3p4
C - 1s2 2s2 2p6 3s1
D - 1s2 2s2 2p6 3s2 3p6 4s1
Answer the following questions with proper reasons.
a) Identify the elements which belong to same period.
b) Identify the elements which belong to same group.
c) Identify the group and period of element 'C'.
d) Write the number of valence electrons and valency of element 'A'.
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