Answer:
The representative elements
belonging to s and p-blocks tend to have noble gas configuration of their
atoms. To achieve this, they do so either by losing the valence electrons or
gaining electrons which is equal to eight minus the number of valence
electrons. For example, valence of sodium (Z = 11) is one because it has one
valence electron (2, 8, 1) which it loses to have the configuration of neon.
Similarly, the valence of chlorine (Z = 17) is also one because it has seven
valence electrons (2, 8, 7) and accepts one electron (8 - 7 = 1) to have the
configuration of nearest noble gas element argon.
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