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| The smallest particle of an element |
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| Substance that cannot be broken down into simpler substances |
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| Negatively (-) charged particle that exists in an electron cloud formation around an atom's nucleus |
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| Positively (+) charged particle in the nucleus of an atom |
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| Electrically neutral particle that has the same mass as a proton and is found in an atom's nucleus |
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| Region surrounding the nucleus of an atom, where electrons are most likely to be found |
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| Anything that takes up space and has mass |
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| Number of protons in the nucleus of each atom of a given element; is the top number of the element in the periodic table |
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| Two or more atoms of the same element that have different numbers of neutrons in their nuclei |
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Sum of the number of protons and neutrons in the nucleus of an atom.
p + n = mass number |
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| Average mass of an atom of an element; its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom |
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| Element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster |
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| Element that is usually a gas or brittle solid at room temperature and is a poor conductor of heat and electricity |
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| Element that shares some properties with both metals and nonmetals |
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| A measure of the amount of matter |
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| Shows which elements and how many atoms of each make up a compound |
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| Matter that has the same composition and properties throughout |
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| A substance produced when elements combine and whose properties are different from each of the elements |
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| A combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture's identity |
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