Question

1. add a neutron to the nitrogen - 14 nucleus. observe how the mass number changes.

determine which particle(s) is/are counted in the mass number.
hint: select all that apply.
select all that apply:
protons electrons neutrons
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Explanation:

The mass number of an atom is calculated as the sum of protons and neutrons in its nucleus. Electrons are not counted in the mass number as their mass is negligible compared to protons and neutrons. When a neutron is added to the nitrogen - 14 nucleus (which originally has 7 protons and 7 neutrons, mass number \(7 + 7=14\)), the new mass number becomes \(7+8 = 15\) (since one more neutron is added). This shows that both protons and neutrons contribute to the mass number.

Answer:

protons, neutrons