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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