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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; the number of protons determines the identity of the element. |
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| Chemistry. one of a class of substances that cannot be separated into simpler substances by chemical means. See also chart under periodic table. |
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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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| the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. |
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| Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound. |
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| a pure substance composed of two or more elements whose composition is constant. |
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| an aggregate of two or more substances that are not chemically united and that exist in no fixed proportion to each other. |
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| corresponding in structure because of a common origin. |
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| having its source or origin outside the organism; having a foreign origin. |
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| such a substance, as dissolved sugar or salt in solution. |
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| having the power of dissolving; causing solution. |
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| A substance dissolved in another substance, usually the component of a solution present in the lesser amount. |
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| the state in which the particles of a substance are mixed with a fluid but are undissolved |
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| A colloid is a type of mechanical mixture where one substance is dispersed evenly throughout another. |
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| A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton |
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| the group of electrons revolving around the nucleus of an atom; a cloudlike group of electrons |
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| the central core of an atom, composed of protons and neutrons, constituting most of its mass but only a small part of its volume. |
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