Which of the following would change if a neutron is added to the nucleus of an atom, but not a proton or electron?
The mass number would increase, but the charge of element would not change.
A neutron is electrically neutral and has a mass of about 1 u.
Mass number = protons + neutrons, so adding a neutron raises the mass number by 1.
Atomic number (protons) and nuclear charge stay the same, so the element is unchanged — a heavier isotope is formed; electrons, and hence chemical reactivity, are unchanged.
Hence, the mass number would increase, but the charge of element would not change.
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