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its atomic number is 56

its atomic weight is 137

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βˆ™ 14y ago
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βˆ™ 7mo ago

A barium atom has 56 protons, 56 electrons, and usually 81 or 82 neutrons. Therefore, a barium atom is typically composed of 137 or 138 particles.

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Q: How many particles make up a barium?
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