Which two particles each have a mass of approximately one atomic mass unit?

June 2023 NY Regents Chemistry Exam

2 Which two particles each have a mass of approximately one atomic mass unit? (1) an electron and a proton

(2) an electron and a positron

(3) a neutron and a proton

(4) a neutron and a positron

Solution: A neutrons and a proton have a mass of approximately one atomic mass unit. Electron is very very small compared to protons and neutrons.

Answer: 3

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