If an atom has an atomic number of 15 and a mass number of 31 according to Bohr's model, what is the number of neutrons present?
The number of neutrons is 16.
In an atom, the atomic number (Z) equals the number of protons, while the mass number (A) is the total count of protons and neutrons present in the nucleus.
The number of neutrons is therefore given by the relation: Number of neutrons = Mass number − Atomic number = A − Z.
Substituting the given values, Number of neutrons = 31 − 15 = 16, which means the nucleus of this atom contains 16 neutrons along with 15 protons.
Hence, the correct answer is The number of neutrons is 16.
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