The group number, number of valence electrons, and valency of an element with atomic number 15 ,…

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
  1. 15,6 and 2
  2. 16,6 and 3
  3. 16,5 and 2
  4. 15,5 and 3

Solution

Atomic number 15 electronic configuration is
15→1s2,2s2,2p6,3s2,3p3
and this element is Phosphorous.
Group no =15
Valence e-⇒e- present in valence shell
=2+3=5
Valency =3 , it needs 3 electron to complete its octet.

Asked in: JEE Main 2019 (12 Apr Shift 1)

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