Structure of the Atom

Each atom is made up of an inner core called the nucleus.

 – Most of the atom’s mass is located in the relatively small nucleus.

 – The rest of the atom is comprised of a relatively large region outside the nucleus where the electrons are found.

– The atom is made of 3 subatomic particles:

1. Positively charged protons
2. Neutral particles called neutrons
3. Negatively charged electrons

– Protons and neutrons are nearly equal in mass .