How many protons, neutrons and electrons are in an atom of Ba 138?

Question

Question

Answer 1

Answer #1

Atomic number of Barium is 56

So,

Number of protons = 56 and since it is an atom so it is electrically neutral therefore Number of electrons = 56

Mass Number = Number of Protons + Number of neutrons

138 = 56 + Number of neutrons

Number of neutrons = 138 - 56 = 82

So,

Number of protons = 56 , Number of electrons = 56 and Number of neutrons = 82

Answer 2

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