Multiple choice

A proton has approximately the same mass as

  1. an electron.

  2. a beta particle.

  3. an alpha particle.

  4. a neutron.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protons and neutrons are both nucleons and have nearly identical masses, approximately 1 atomic mass unit (amu). Electrons have a much smaller mass, about 1/1836 of a proton.

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