Element P has atomic number 19. To which group and period, does P belong?

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Solution

Given,
Atomic number of P is 19.
Electronic configuration of element P is 2, 8, 8, 1.
Now,
Period number = no. of shells = 4
and
Group number = no. of valence electrons= 1

Thus, element P belongs to the 4th period and 1st group.

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