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Definition
| "Anything that has mass and takes up space and is made up of different kinds of atoms; includes all things that can be seen, tasted, smelled, or touched but does not include heat, sound, or light" |
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Term
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Definition
| "A very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons." |
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| States that matter is not created or destroyed but only changes its form. |
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Term
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Definition
| "Invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom." |
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Definition
| "Positively charged, central part of an atom." |
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Term
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Definition
| Positively charged particle located in the nucleus of an atom and that is counted to identify the atomic number. |
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Definition
| An uncharged particle located in the nucleus of an atom. Neutral or no charge. |
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Term
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Definition
| A spherical cloud of varying density surrounding the nucleus. The varying density shows where an electron is more or less likely to be. Atoms with electrons in higher energy levels have additional electron clouds of different shapes that also show where those electrons are likely to be. |
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Definition
| Smaller parts of protons and neutrons. |
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Term
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Definition
| "Natural or synthetic material that cannot be broken down into simpler materials by ordinary means; has unique properties and is generally classified as a metal, metalloid, or nonmetal." |
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Definition
| Number of protons in the nucleus of each atom of a given element; the top number in the periodic table. |
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Definition
| Two or more atoms of the same element that have different numbers of neutrons in their nuclei. |
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Definition
| Sum of the number of protons and neutrons in the nucleus of an atom. |
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Definition
| "Average mass of an atom of an element; its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom." |
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Term
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Definition
| "Element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster." |
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Term
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Definition
| Elements that are usually gases or brittle solids and poor conductors of electricity and heat; are the basis of the chemicals of life. |
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Term
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Definition
| Element that has characteristics of both metals and nonmetals and is a solid at room temperature. |
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