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| a form of matter that has constant chemical composition and characteristic properties. |
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| composed of parts or elements that are all of the same kind |
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| a component or constituent of a whole or one of the parts into which a whole may be resolved by analysis |
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| any substance composed of identical molecules consisting of atoms of two or more chemical elements. |
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| a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. |
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| the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. |
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| an elementary particle having no charge, mass slightly greater than that of a proton, and spin of ½: a constituent of the nuclei of all atoms except those of hydrogen. |
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| an elementary particle that is a fundamental constituent of matter, having a negative charge |
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| the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction |
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| the group of electrons revolving around the nucleus of an atom |
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| a central part about which other parts are grouped or gathered |
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