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9 Cards in this Set
- Front
- Back
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atomic number |
number of protons in nucleus |
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atomic mass number |
sum of protons and neutrons |
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isotopes |
variants of the same element; different number of neutrons |
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radioisotopes |
radioactive isotope will decay unstable nucleus (too many neutrons) emits energy and particles transforms radioisotope into different element |
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electronegativity |
attracts electrons |
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electron affinity |
energy change that occurs when an atom gains an electron |
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atom |
smallest unit of element that still retains that element's properties |
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how do ions (cations and anions) form? |
Metal atoms form positive ions, while non-metal atoms form negative ions |
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four most common elements in living things |
oxygen, carbon,hydrogen, and nitrogen |
