What is the location of protons and neutrons in an atom?
In the center of an atom
What are the three types of subatomic particles?
Proton, neutron, and electron
What is the location of an electron in an atom?
Around the center, NOT in the center
What is the mass number of a proton and neutron?
1
Mass numbers have no units. It is just simply a number. It is also NOT the atomic mass unit. They are are two discrete things.
What is the nucleus?
Center of an atom. Remove the protons and neutrons from the center and there is nothing left
What is the mass number of an electron particle?
0