Question

What subatomic particle has a mass of 1/2,000 amu?
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The alpha particle
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The proton
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The neutron
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The electron

Answer 1

The subatomic particle that has a mass of approximately 1/2,000 amu (atomic mass unit) is the **electron**. Electrons have a mass that is roughly 1/1836 amu, which corresponds to the 1/2,000 figure mentioned in your question. In comparison, protons and neutrons have masses around 1 amu each, and alpha particles (which consist of two protons and two neutrons) would have a significantly greater mass.