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Periodic Table
| Term | Definition |
|---|---|
| valence shell | Outermost shell of an atom |
| atomic mass | Number of protons plus the number of neutrons |
| conductivity | Ability for heat or electricity to flow through it |
| neutron | Part of an atom with a neutral charge |
| electron | Part of an atom with a negative charge |
| malleable | Able to be flattened out |
| ductile | Able to be stretched without breaking; not brittle |
| proton | Part of an atom with a positive charge |
| luster | Ability to reflect light |
| reactive | Causes a chemical reaction and releases energy |
| family | Also called group; columns on the periodic table (go up and down); Elements in a group have the same number of electrons in the outer level |
| period | Rows on the periodic table (side to side); Each row represents the number of energy levels |
| Groups | Go up and down (remember - the word UP is in groups); show the number of valence electrons; 18 total |
| Families | another name for groups |
| Periods | Go side to side, show the number of electron shells (or energy levels); 7 total |
| Elements that are the most similar are in the same _______ | group |
| Anything on the periodic table is ___ ________ | an element |
| Compound | combination of two or more elements that are CHEMICALLY combined |
| Mixture | PHYSICALLY combined, can be separated |