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7 Cards in this Set
- Front
- Back
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Atom |
The smallest unit of matter that cannot be broken down by chemical means |
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element |
a pure substance made of only one kind of atom. Example: boron, hydrogen, helium |
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compound |
a substance made of the joined atoms of two or more different elements. |
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molecule |
group of atoms held together by covalent bonds |
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covalent bonds |
when two or more atoms share electrons to form a molecule |
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hydrogen bonds |
a weak chemical attraction between polar molecules. A water molecule has an unequal distribution of electrical charge making it a polar molecule. |
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ion |
an atom or molecule that has gained or lost one or more electrons |
