Question

Two elements are denoted as following has A having mass number 40 and atomic number 20 and B having mass number 40 and atomic number is 18 find the no of electrons present in a and b

Answer 1

Atomic no. 20 :- Calcium

Calcium atomic mass :- 40

Atomic no. 18 :- Argon

Argon atomic mass :- 40

so A will have 20 electrons and B will hav 18 electrons each