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chemistry:chapter 4
| Term | Definition |
|---|---|
| atom | the smallest particle of an element that retains the identity of the element |
| atomic mass | the weighted average of the masses of all of an element's isotopes |
| atomic number | the number of protons in an atom |
| Cathode ray | a glowing beam of electrons |
| Dalton's Atomic Theory | the first supporting evidence of the existence of atoms |
| electron | a negatively charged subatomic particle with a negligible mass, found outside the nucleus of an atom |
| isotopes | atoms of an element with different numbers of neutrons and therefore different masses |
| mass number | the number of protons and neutrons in an atom |
| neutron | a neutrally charged subatomic particle found in the nucleus of an atom |
| nucleus | a dense, positively charged, and centrally-located region in the atom |
| proton | a positively charged subatomic particle found in the nucleus of an atom |
| theory | well-tested, scientifically accepted explanation of a broad set of observations |
Created by:
Maydavis
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