Question

Describe the particles that make up the nucleus of an atom in terms of mass and charge.

Answer 1

The nucleus of an atom is composed of protons and neutrons.

Protons and neutrons have roughly the same mass (1 amu), but protons are positively charged while neutrons are neutral.

Answer 2

@matt101 is correct.
http://www.globalsecurity.org/wmd/library/policy/army/fm/8-9/fig2-I.gif

This one shows you a better view of where neutrons and protons are located.