Question

An isotope with a mass number of 193 has 116 neutrons. What is the atomic number of this

isotope?
f 12
in the

Answer 1

Atomic number of this isotope = 77

Step-by-step explanation:

Given that,

Mass number = 193

No of neutrons = 116

We need to find the atomic no of this isotope.

We know that,

Atomic mass = No of protons + No. of neutrons

Also, atomic no = no of protons

So,

Atomic mass = atomic no + No. of neutrons

⇒ Atomic no = Atomic mass - no of neutrons

Atomic no = 193 - 116

Atomic no = 77

Hence, 77 is the atomic no of the isotope.