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The atomic number of barium is 56. So there are 56 protons and 56 electrons.

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Wiki User

11y ago
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Wiki User

11y ago

Barium-136 Mass number = 136

Atomic number = 56

Protons = Atomic number = 56

Neutrons = Mass number - Atomic number = 136 - 56 = 80

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Wiki User

13y ago

Barium-137 has 81 neutrons.

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Senator Clay

Lvl 2
2y ago

56

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Wiki User

15y ago

56 protons

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Wiki User

13y ago

80 neutrons

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Q: How many neutrons are contained in an atom of barium - 136?
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