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the mass number of an atom is 15, and its atomic number is 7. the atom probably has... the mass number of an atom is 15, and its atomic number is 7. the atom probably has... at least 15 electrons. 7 electrons in the nucleus. 7 units of negative charge in the nucleus. 8 neutrons in the nucleus. about as much mass in electrons as in protons.

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Dejanras

The atom probably has 8 neutrons in the nucleus.

Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.

N(p⁺) = Z = 7; number of protons in the atom

A = N(p⁺) + N(n°)

N(n°) =  A -  N(p⁺)

N(n°) = 15 - 7

N(n°) = 8; number of neutrons in the atom

N(e-) = N(p⁺) = 7; number of electrons in the atom

Neutron (symbol: n°) is a subatomic particle with no net electric charge.

Protons and neutrons are found in nucleus of an atom (atomic nuclei).  

More about neutron: brainly.com/question/15120322

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