| A | B |
|---|
| nucleus | the middle of an atom |
| proton | a tiny, positively charged subatomic particle |
| subatomic | means inside/smaller than an atom |
| particle | tiny bit/part of matter |
| matter | what everything in the universe is made of (atoms) |
| atom | the basic unit of matter, what everything is made of |
| neutron | a subatomic particle with no charge; found in nucleus |
| electron | tiniest subatomic particle; has a -1 charge |
| levels | where electrons are found; like imaginary circles around the nucleus |
| shell | another word for electron levels (orbits) |
| valence shell | the outer shell of an atom |
| valence electron | an electron in the outer shell of an atom |
| charge | can be negative, neutral (0) or positive |
| electrostatic charge | a fancier Science word for 'charge' |
| atomic number | = the number of protons in nucleus |
| mass number | = protons + neutrons in nucleus |
