What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative mass of an electron
0/ negligible
Which two subatomic particles make up the nucleus of an atom?
Protons + Neutrons
What is an atom called that has a positive or negative charge?
An ion
How do electrons relate to the nucleus?
They orbit the nucleus in energy shells
Where is the atomic number?
Top left of the element
How is the atomic number determined?
Number of protons in the nucleus