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| the smallest component of an element having the chemical properties of the element |
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| a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. |
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| an elementary particle having no charge |
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| The nucleus is now understood to be a quantum system composed of protons and neutrons, particles of nearly equal mass and the same intrinsic angular momentum |
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| the group of electrons revolving around the nucleus of an atom |
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| one of a class of substances that cannot be separated into simpler substances by chemical means. |
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| the number of positive charges or protons in the nucleus of an atom |
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| 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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| composed of two or more parts |
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| any combination or blend of different elements |
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| any combination of substances that has uniform composition and properties |
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| any combination of substances that does not have uniform composition and properties |
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| the process by which a gas, liquid, or solid is dispersed homogeneously in a gas, liquid, or solid without chemical change. |
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| A substance in which another substance is dissolved, forming a 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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| British chemist whose pioneer work on the properties of gases led to his formulation of the atomic theory. He also studied his own condition of colorblindness. |
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