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| a property that can be observed or measured without changing the identity of the sample of mater |
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| a change in matter in which the identity of the material involved does not change |
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| an interaction of matter that results in the formation of one or more new substances |
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| properties only observed or measured by changing the chemical identity of a sample of matter |
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| a chemical reaction with oxygen gas that produces thermal energy and light: burning |
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| the reflection of light from the surface of a material |
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| a property of a material that permits it to be stetted into a wire without breaking |
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| a material possessing properties such as luster, ductility, conductivity, and malleability |
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| a material possessing properties such as brittleness, lack of luster, an non conductivity; nonmetals are often insulators |
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| a material with properties intermediate between those of metals and nonmetals |
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| a material that allows electricity (or thermal energy) to flow through it |
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| a material that does not allow electrical current (or thermal energy) to flow through it |
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| the property of a material that permits it to be flattened without shattering |
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| a property of a material that causes it to shatter under pressure |
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| the number of protons in an atom; this value distinguishes atoms of different elements |
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| the dense, positively charged central region of an atom that contains protons and neutrons |
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| the sum of the number of protons and neutrons in the nucleus of an atom of a particular isotope |
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| atoms of the same element with differing numbers of neutrons |
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| a horizontal row of elements in the periodic table |
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| regular patterns among chemical and physical properties of elements arrayed in the periodic table |
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| a vertical column of elements in the periodic table; also called a family; group members share similar properties |
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| a vertical column of elements in the periodic table; also called a group; family members share similar properties |
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| the group of elements consisting of lithium, sodium, potassium, rubidium, cesium, and francium |
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| an unreactive element belonging to the last (right-most) group on the periodic table |
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| the group of elements consisting of fluorine, chlorine, bromine, iodine, and astatine |
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