How many neutrons are in Barium-137

a-137

b-81

c-112

e-56

Barium 137 has 81 neutrons. Neutron has no charge

while atomic number is the sum of protons and neutrons and is represented by Z.

Atomic mass is the sum of proton, neutrons and electrons and is there combine to make an atomic mass.

Isotopes are the atoms of different elements that are physically same but chemically different. So barium occur in many isotopic form out of which Barium 137 is common.

Barium has 81 neutrons, along with 56 protons and 56 electrons.

Since Barium has an atomic number of 56, that means that the protons and electrons will also have 56. Barium has an atomic mass of 137.327. We can round it to the whole number and then subtract it by our atomic number of 56. The rounded number would be 137, so now we can subtract 137 - 56 to get 81, which is how many neutrons are in Barium.