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Matter
6.5 Matter
| Term | Definition |
|---|---|
| Element | pure substance that cannot be broken down. |
| Atom | smallest particle of an element, building block of matter |
| Proton | positively charged particle in the nucleus |
| Neutron | particle in the nucleus with no electrical charge |
| Electron | negatively charged particle that moves around the outside of the nucleus |
| Molecule | group of two or more atoms held together |
| Compound | two or more elements chemically combined |
| Chemical bond | electrical force that holds one atom to another |
| Period Table of Elements | Chart of all know elements. 118 elements |
| Electron Shell | first shell holds 2 electrons, second shell holds 8, the third shell holds 18 |
| Atomic number | number of protons in an element |
| Atomic Mass | the number of protons plus neutrons in an element |