Good acronym to remember that atomic mass equals the protons plus neutrons.

Understand the Problem

The question is asking for a mnemonic or acronym that can help remember the relationship that atomic mass is equal to the sum of protons and neutrons in an atom.

Answer

PEN = Proton, Electron, Neutron.

The final answer is PEN = Proton, Electron, Neutron.

Answer for screen readers

The final answer is PEN = Proton, Electron, Neutron.

More Information

The acronym 'PEN' signifies Proton, Electron, Neutron, helping to remember the components of atoms. While electrons don't contribute to atomic mass directly, protons and neutrons do. Therefore, the mass number is the sum of protons and neutrons.

Tips

A common mistake is thinking electrons contribute to the atomic mass, but they have negligible mass.

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