Question

Determine the valency of an element x whose atomic number is 15

Answer 1

an element with atomic number x is phosphorous as argon is an inert gas of atomic number 18, phosphorous gains 3 electrons to get stability so its valency is -3

Answer 2

Hey Dear,

◆ Answer -

Valency of element X is -3.

◆ Explaination -

• Element X with atomic number 15 is Phosphorus (P).
• Electronic configuration of phosphorous is 2, 8, 5.
• It has 5 electrons in its last orbit which can be completely filled by accepting 3 electrons.

Therefore, valency of element X is -3.

Hope this helps you.