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Science Vocabulary #12

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Across
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A material made up of two or more different substances which are mixed but are not combined chemically.
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It tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.
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A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
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It states that mass is neither created nor destroyed.
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It is used to describe where electrons are when they go around the nucleus of an atom.
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A character, usually a letter or number, that's printed slightly below and to the side of another character.
Down
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Is a negatively charged subatomic particle.
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The shorthand scientists use to describe a chemical reaction.
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The number in front of the formula. It tells us how many molecules of a given formula are present.
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Defined as substances that are made of only one type of atom or only one type of molecule.