Assign the position of the element having outer electronic configuration.
a. ns² np⁴ for n = 3
b. (n -1)d² ns² for n = 4
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outer most orbit has 6electron ie it belong to group 16
b since the second last shell has electron in d group so it belongs to 4B group
b since the second last shell has electron in d group so it belongs to 4B group
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