Question

3 Which 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​

Answer 1

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.