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ATS-Science 8
Atoms-Chpt 12 Test Review
Question | Answer |
---|---|
Define atom | Smallest particle into which an element can be divided & still be the same substance. (The # of protons in its nucleus identifies an atom.) |
Define isotope | An atom with the same number of protons as other atoms of the same element-but- has a different number of neutrons = a different mass # |
Define ion | A charged particle that forms when an atom or group of atroms gains (negative) or loses (positive) one or more electrons. |
The mass number equals the total number of _______ and _______. | protons neutrons |
Define electron | A subatomic particle that has negative charge and surrounds the nucleus. Discovered by Thomson. |
Define neutron |