Protons are...

Neutrons are...

Electrons are...

The nucleus is...

What does the nucleus of an atom contain?

Almost the whole mass of the atom is...

Particle- Proton

Particle- Neutron

Particle-Electron

Neutral atoms have...

The charge on the electrons is the same size as...

The number of protons always equals the...

If some electrons are added or removed...

The number of neutrons isn't fixed but is usually about...

Its the number of protons in an atom that decided what element it is...

Atoms of the same element all have the same number of protons...

Elements all have...