Biology Chapter 2: The Chemistry of Life (2-1 The Nature of Matter)
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Created by:
hwnFLIP on June 19, 2008
Subjects:
biology, chapter 2, the chemistry of life
Description:
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15 terms
Terms | Definitions |
|---|---|
 atom | the basic unit of matter |
| subatomic particles | protons, neutrons, and electrons |
| protons | positively charged |
| neutrons | no charge, neutral |
| nucleus | center of the atom, binded together by protons and neutrons |
| electron | negatively charged, are in constant motion around the nucleus |
| element | a pure substance that consists entirely of one type of atom |
| isotopes | atoms of the same element that differ in the number of neutrons they contain |
| mass number | sum of protons and neutrons in the nucleus of an atom |
| "weighted" | the abundace of each isotope in nature is considered when the average is calculated |
| all isotopes of an element... | have the same chemical properties |
| radioactive isotopes | the nuclei are unstable and breack down at a constant rate over time |
| radioactive isotope use 1 | age of rocks and fossils |
| radioactive isotope use 2 | treact cancer and kill bacteria that causes food to spoil |
| compound | a substance formed by the chemical combination of two or more elements in definite properties |
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