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| What are atoms? What three subatomic particles make up an atom? |
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| Smallest units that retaon the propeties of life; protons, nuetrons, and electons. (p+, n0, e-) |
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| Elements fall into order on the periodic table by |
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| How many elements occur baturally on earth? |
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| An element's atoms can differ in their number of |
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| What;s an isotops mass number? |
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Definition
| superscript to the left of the # is the mass #. p+ plus n0 |
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| Three common carbon isotopes. |
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Definition
C-12 (6 p+. 6 n0)
C-13 (6p+. 7n0)
C-14 (6 p+ 8 nuetrons) |
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| Too many or too few nuetrons can cause |
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| an atom to become radioactive. |
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