Question

An atom of an element has 2K, 2 points
8L and 5M electrons. Find out
the Element, Atomic number,
No. of Protons and Valency of
the element.​

Answer 1

Answer:

Explanation:

2 K---->2 electrons

8 L----->8 electrons

5 M----->5 electrons

          adding them we get 2+8+5=15

 so it means

 Atomic number-15

no. of protons= 15

valency will be  either 3 or 5

( as it has a electronic configuration of 2,8,5   outermost shell have 5 electrons so it will gain 3 electrons according to octet rule but due to its structure it can also lose 5 electrons , that depends)  

 name of the element - Phosphorus