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Atomic Theory
7th Grade Vocab
| Vocabulary | Definition |
|---|---|
| Atoms | The make up of matter; in solid, liquid, or gas form |
| Element | When something is made up of only one kind of atom |
| Proton | Found inside the nucleus , it has a positive charge |
| Electron | Found on the outside of the nucleus, it has a negative charge |
| Neutron | Has equal mass to a proton but instead has no charge; also found in the nucleus |
| Nobel Gases | Found in Group 18, these are the inert elements, so they are very unreactive |
| Halogens | These elements are very reactive because of their 7 valence electrons, They are found in group 17 & most commonly form bonds with the alkali metals |
| Transitional Metals | These elements are found in groups 3-12 and are reactive while other may not be. it all depends on the element |
| Alkali Metals | These metals are very reactive because of their one valence electrons |
| Alkali Earth Metals | Found in the second column, these metals are slightly less reactivate, unlike the alkali metals |
| Alloy | A metal made by combining two or more metallic elements |
| Luster | Shiny |
| Ductile | Can be drawn into a thin wire |
| Malleable | Can be smashed without crumbling |
| Density | The degree of compactness of a substance; solidity, mass, thickness |
| Corrosive | Rusts |
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