16 The mass of a proton is approximately equal to the mass of A) a beta particle
B) a neutron
C) an alpha particle
D) an electron

B) a neutron

Explanation:

The mass of a proton is approximately the mass of a neutron.

Both a neutron and proton are nuclear particles that are found within the nucleus of an atom.

Protons are the positively charged particles within an atom.

Neutrons do not have any charges on them.

 Approximately the mass of:

              Protons  = 1.67 x 10⁻²⁷kg

              Neutrons  = 1.68 x 10⁻²⁷kg

they are made of gases.

they have a spherical shape.

they make energy through fusion.