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13 Cards in this Set
- Front
- Back
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Matter |
Anything that has mass or takes up space |
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Element |
The simplest pure substance, that cannot be broken up into smaller pieces |
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Compound |
Two elements that are chemically combine |
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Mixure |
Two elements that are combined but not chemically |
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Atom |
The smallest part of an atom |
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Scientific theory |
A well-tested idea that explains and connects a wide range of observations |
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Model |
Physical, mental, visual, and other representations ofan idea to help people understand what they cannot observedirectly. |
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Electron |
A negative charge in an atom. |
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Proton |
A positive charge in an atom |
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Neutron |
A neutral charge in an atom |
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Neuclus |
The center of an atom |
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Energy level |
A regionaround the nucleus in which electrons of the same energy arelikely to be found |
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Valence electrons |
All electrons in the last energy level |
