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Which subatomic particle has nearly the same mass as a proton?
AElectron, mass about 1/1836 u
BNeutron, mass about 1 u
CAlpha particle, mass about 4 u
DBeta particle, mass equal to electron
Answer & Solution
Correct answer: B. Neutron, mass about 1 u
1. Protons and neutrons sit in the nucleus.
2. The chapter says both have mass about 1 u.
3. Electrons are about 1/1836 u, much lighter.
4. So neutron has nearly the same mass as proton.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on neutron_
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