Question

An element 'x' has '5' electrons in its 3rd shell (Valence Shell), what is the atomic
number of the element right below it?
A) 15
C) 23
C) 33
D) 51​

Answer 1

Answer:

Option A, 15 Phosphorus it has 5 electrons in its 3 rd shell.

Hope it helps you !!

Answer 2

Answer:

2,8,5

then atomic number = 15