| A | B |
|---|
| matter | a substance everything is made up of |
| atom | the smallest unit of an element |
| molecule | smallest particle of a compound; made up of two or more atoms |
| proton | positive charge inside the nucleus of an atom |
| elecrons | particles that travel around the nucleus of an atom |
| valence electron | an electron of an atom that can be shared with another atom (covalent bond) |
| ion | electrically charges atom (positive or negative) formed by the loss or gain of 1 or more electrons |
| isotope | two or more forms of a chemically formed element having different atomic weight |
| electron cloud | group of electrons revolving around the nucleus of an atom |
| covalent bonds | atoms SHARE electrons to fill outer shells |
| ionic bonds | atoms TRANSFER (loses or gains) electrons |
