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Barium has 56 electrons and protons; the number of neutrons is specific for each isotope.

Number of neutrons in a barium isotope = Mass number - 56

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How many subatomic particles and isotopes in barium?

Barium has 56 protons in its nucleus, making it a chemical element with an atomic number of 56. In its most abundant isotope, barium-138, it contains 82 neutrons. Barium has several isotopes, with a total of 13 known isotopes ranging from barium-130 to barium-144, but barium-138 is the most stable and common. In terms of subatomic particles, a typical barium atom has 56 protons and 82 neutrons, plus 56 electrons in its neutral state.


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