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.
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
Held on 12 Apr 2019 · Verified 6 Jul 2026.
15,6 and 2
16,6 and 3
16,5 and 2
15,5 and 3
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