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| substance with atoms that are all alike |
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| substance formed from two or more elements in which the exact combination and proportion of elements is always the same. |
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| the smallest particle of an element that still retains the properties of the element. |
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| positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons. |
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| particle, composed of quarks, inside the nucleus of an atom that has a charge of +1. |
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| neutral particle, composed of quarks, inside the nucleus of an atom. |
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| particle surrounding the center of an atom that has a charge of -1. |
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| particle of matter that makes up protons and neutrons. |
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| area around the nucleus of an atom where the atom’s electrons are most likely to be found. |
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| amount of matter in an object. |
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| number of protons in an atom’s nucleus. |
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| sum of the number of protons and neutrons in an atom’s nucleus. |
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| atoms of the same element that have different numbers of neutrons. |
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| weighted-average mass of the mixture of an element’s isotopes |
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| any characteristic of a substance, such as flammability, that indicates whether it can undergo a certain chemical change. |
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| organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties. |
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| vertical column in the periodic table. |
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| uses the symbol for an element and dots representing the number of electrons in the element’s outer energy level. |
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| horizontal row in the periodic table |
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