Question

If the atomic number of an element is 20u and mass number is 40u find the number of neutrons, protons, and electrons?

Class 9​

Answer 1

Explanation:

let the element be

40

X

20

number of electrons (or) protons is the atomic number

number of neutrons is the mass number is the mass number

hence , number of protons = number of electrons = 20

number of neutrons = 40