Practice Quiz

Praxis II General Science

Category - Major Ideas

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Of the basic parts of the atom, which one weighs the most in atomic mass units (amu)?
  1. Proton
  2. Neutron
  3. Electron
  4. Protons and neutrons both weigh about the same, and more than electrons.
  5. Protons and electrons both weigh about the same, and more than neutrons.
Explanation
Answer: D - Protons and neutrons both weigh slightly more than 1 amu, although a neutron is technically 0.0014 amu heavier than a proton. Electrons weigh the least out of the three, at only 0.00055 amu each.
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