Bio 1406 Lecture: Chapter 2
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Created by:
mrsswanholm on January 25, 2009
Subjects:
Biology 1406, Chapter 2, lecture
Description:
North Lake Community College Biology 1406 with instructor R.Hembree
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9 terms
Terms | Definitions |
|---|---|
 element | substance that cannot be broken down to other substances |
| compound | two or more different elements combined in a fixed ratio |
| trace elements | required by an organism in only minute quantities |
| atom | smallest unit of matter that still retains properties of an element |
| atomic nucleus | atom's tightly packed core of protons and neutrons |
| matter | anything that takes up space and has mass |
| O, C, H, N | elements making up about 96% of human body |
| dalton | unit of measure for subatomic particles aka atomic mass unit |
| atomic number | number of protons in the atom of an element |
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