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17 Cards in this Set
- Front
- Back
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matter
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anything that has mass and takes up space
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atoms
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the basic building blocks of matter
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nucleus
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the center of an atom; in biology, this is also the center of the cell that holds the DNA
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protons
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small, positively charged particles found in the nucleus of an atom
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neutrons
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small, neutrally charged particles found in the nucleus of an atom
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electrons
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small, negatively charged particles found in the area around the outside of the nucleus of an atom
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model
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an explanation or representation of something that cannot be seen. Well, actually sometimes it can be seen, but it is a representation of what the object actually is.
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Bohr model
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A model of the atom which shows the nucleus in the center and the electrons whirling in circular orbits.
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element
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a pure substance in which all atoms contain the same number of protons
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C
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symbol for carbon
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N
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symbol for nitrogen
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H
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symbol for hydrogen
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P
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symbol for phosphorus
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O
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symbol for oxygen
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S
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symbol for sulfur
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molecules
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chemicals that result from atoms linking together
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chemical formulas
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abbreviations for chemical molecules
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