3which subatomic particles make up a majority of the
mass of an atom?
1. protons
2. electrons
3. neutrons
a 1 only
b 1 and 3 only
c 3 only
d 2 and 3 only

1 and 3 only, electrons are significantly smaller than both neutrons and protons. Neutrons and protons also make up the biggest part of the atom, the nucleus.

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Is it just free response or do you have multiple choice?