12th November 2019

socratic
14

How many neutrons are in Barium 137?

Thus the "barium" in "barium 137" means 56 protons. And the 137 for the mass number designates 137 total protons protons plus neutrons. To get just the number of neutrons you take the difference between protons and mass number, thus 137−56=81 .

How many electron shells are there in barium?

Data Zone
Classification:Barium is an alkali earth metal
Protons:56
Neutrons in most abundant isotope:82
Electron shells:2,8,18,18,8,2
Electron configuration:[Xe] 6s2
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