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| smallest unit of matter that cannot be broken down by chemical means |
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| the center of an atom made up of protons and neutrons |
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| where most of the mass of an atom is found |
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| corresponds to the number of protons that an atom contains |
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| the theory that states that all matter is made up of small subunits called atoms |
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| bond formed when two or more atoms share electrons |
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| molecule made up of two atoms |
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| in an atom, a negative particle that moves around the nucleus |
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| specific energy level where electrons are found as they move around the nucleus of an atom |
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| substance composed of a single type of atom |
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| elements that have seven electrons in their outer shell, are non-metallic, and are called salts |
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| electrically charged atom or molecule |
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| one or two or more forms of an element having the same number of protons but different numbers of neutrons |
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| elements that have properties of both metals and nonmetals |
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| one of a category of opaque, ductile, and typically lustrous elements tha conduct heat and electricity well |
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| smallest particle of a substance that retains all the properties of the substance and is composed of two or more atoms bonded by the sharing of electrons |
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| in an atom, a neutral particle found in the nucleus |
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| elements that are gaseous at room temperature and have neither the properties of metals nor nonmetals |
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| these elements are very stable and do not generally participate in chemical reactions |
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| elements that so not have the properties of metals and in which the outermost energy shells contain more than four electrons |
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| positively charged particle in the nucleus of an atom |
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| transfer of hear, light, or energy by means of electomagnetic waves |
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