The Chemical Context of Life
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| 916451934 | Element | substance that cannot be broken down to other substances by chemical reactions | 0 | |
| 916451935 | Compound | substance consisting of two or more different elements combined in fix ratio | 1 | |
| 916451936 | Essential elements | elements that organisms need to live a healthy life and reproduce (naturally) | 2 | |
| 916451937 | Trace elements | required by an organism in only minute quantities (SUCH AS IRON) | 3 | |
| 916451938 | Atom | smallest unit of matter that still retains the properties of an element | 4 | |
| 916451939 | Neutrons | electrically neutral | 5 | |
| 916451940 | Protons | positive charge | 6 | |
| 916451941 | Electron | negative charge | 7 | |
| 916451942 | Atomic nucleus | protons and neutrons packed together in a tight core; center of an atom; | 8 | |
| 916451943 | Dalton | atoms and subatomic particles, the unit of measurement used is... | 9 | |
| 916451944 | Atomic number | the number of protons that can be found as a subscript of the element | 10 | |
| 916451945 | Mass number | the number of neutrons, which is the sum of protons and neutrons in the nucleus of the atom | 11 | |
| 916451946 | Atomic mass | total mass of the atom | 12 | |
| 916451947 | Isotopes | different atomic forms where an element has the same number of protons but some atoms have more neutrons than other atoms of the same element WHICH MEANS MORE MASS | 13 | |
| 916451948 | Radioactive isotope | nucleus delays spontaneously, giving off particles of energy | 14 |
