how many neutrons are in Barium-137 a-137 b-81 c-112 e-56

Chemistry · High School · Sun Jan 24 2021

Answered on

Given :

Barium -137

Atomic mass of Barium = 137

Atomic number = 56

We know, atomic number is always equal to number of protons.  Hence, protons = 56

Atomic mass of any element = protons + neutrons

137 = 56 + neutrons

neutrons = 137 - 56

= 81