Question

Determine the number of electrons ,protons and neutrons present in the following atoms

(6 M)

1. 88Ra226 2. 73 Ta 181​

Answer 1

Answer: In Ra electrons=88, protons=88, neutrons= 118

In Ta electrons= 73, protons=73, neutrons= 108

Explanation: Atomic no. (Z)= No. of protons in an atom

Atomic mass (A)= No. of protons + No. of neutrons

and number of electrons in an atom is = No. of protons.

1. In Ra (z)= 88

            A= 226-88= 118

2. In Ta (Z) = 73

              A= 181-73= 108