Elements
What is the atomic number of oxygen(O)?
8
What is the positive electric charge
proton
How many protons are in Helium (He)
2
Negative electrical charge
Electron
What is the chemical symbol (abbreviation) of Cobalt
Co
Neutral or no electrical charge
Neutron
How many elements are in the periodic table
118
What is in the middle of an atom
Nucleus
What does the numbers at the bottom of an element mean?
Atomic mass
What is outside of the atom
Electron shell