| A | B |
|---|
| Nucleus | is the center of the atom where neutrons and protons are located. |
| Protons | are positively charged particles (p+) |
| Neutrons | are particles that have no charge (n0) |
| Electrons | are negatively charged particles that are located outside the nucleus |
| Element | is a pure substance that cannot be broken down into other substances |
| Isotopes | Atoms of the same element with different number of neutrons |
| Compounds | when two or more elements combine |
| Covalent Bond | a bond that forms when atoms share electrons |
| Molecule | is a compound in which the atoms are held together by covalent bonds |
| Ionic Bond | is an electrical attraction between two oppositely charged ions |
| van der Waals forces | attractions between positive and negative regions that can hold molecules together |
