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15 Cards in this Set
- Front
- Back
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what are atoms measured in?
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AMU- Atomic Mass Units
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parts of an atom
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nucleus
orbit shells |
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nucleus
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center of the atom
99.9% of the mass 100000 times smaller than the entire atom |
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protons
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positive charge, center of the atom
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electrons
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negative charge
outside of the atom/orbit shell |
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neutrons
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no charge
inside the atom |
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top number
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atomic number
number of protons |
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bottom number
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atomic massnumber of protons and neutrons
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column I
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alkali metals
highly reactive never found in elemental form |
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column II
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alkaline earth metals
very reactive, not as reactive as alkali |
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column III
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transition metals
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column IV
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carbon group
elements share their electrons |
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hydrogen
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placed at the top of group 1 for convenience
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column VII
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halogens
incredibly reactive harmful to organisms |
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column VIII
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noble gasses
odorless low chemical re-activity |
