Question

What are the three particles of an atom?

A. Proton, ion, and valencium
B. Proton, neutron, and electron
C. Electron, proton, and isotope
D. Neutron, electron, and ion

Answer 1

atoms are made up of protons and neutrons in the nucleus, and electrons surrounding the nucleus, so B

Answer 2

The three particles of an atom is B; Protons, Neutrons, and electrons.

Here's more facts according to Google.com
"Protons have a relative mass of 1 and a charge of +1, and they are found in the nucleus of an atom. Neutrons have a relative mass of 1 and no charge, and they are also found in the nucleus of an atom. Electrons have a relative mass of 1/1836 and a charge of -1."

I truly hope I helped!