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| substance made up of only one type of atom |
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| vertical column of the periodic table. shows the number of electrons in the outer shell |
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| horizontal row of the periodic table. shows the outermost electron shell being filled |
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Definition
| positively charged particles found in the nucleus |
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| central part of an atom made up of protons and neutrons |
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Definition
| negatively charged, very light particles found in an atom. electrons move around the nucleus |
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| the number of protons in an atom. determines which element |
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Definition
| the number of protons and neutrons in an atom |
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Definition
| particle or energy released from the nucleus of an atom as it decays |
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Definition
| an atom of the same element with a different number of neutrons |
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Definition
- follows the pattern 2,8,8,2
- number of electrons in the outer shell
- once the shell fills up it created a new shell/period
- full outer shell is the most stable |
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Definition
| an ion is formed when an atom loses or gains an electron |
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Definition
| a positive charged ion that has lost an electron |
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Definition
| a negative charged ion that has gained an electron |
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| why do atoms lose and gain electrons |
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Definition
| atoms lose and gain electrons to make them stable which is called ionic bonding |
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Definition
| each combination of an element with a different number of neutrons |
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Term
| what are the three types of radiation |
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Definition
alpha (2 protons and 2 neutrons)
beta (electron)
gamma (wave of energy) |
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Term
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Definition
| the time taken for half of a radioactive atom to decay |
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