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What is an atom?
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An atom is the smallest unit of an element that retains all the properties of that element.
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Name the three subatomic particles in an atom.
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Protons, neutrons, and electrons.
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What is the charge of an electron?
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Negative.
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Where are protons and neutrons located in an atom?
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In the nucleus.
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What does the atomic number represent?
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The number of protons in an atom.
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What is a molecule?
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A molecule is a group of two or more atoms bonded together.
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What is the difference between an element and a compound?
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An element is a pure substance made of only one kind of atom, while a compound consists of two or more elements chemically combined.
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What is the periodic table?
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A chart of the elements arranged according to their atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.
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Who is credited with creating the first periodic table?
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Dmitri Mendeleev.
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What is an ion?
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An atom or group of atoms that has a positive or negative charge due to the loss or gain of one or more electrons.
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What are isotopes?
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Atoms of the same element with different numbers of neutrons and therefore different atomic masses.
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Define the term 'relative atomic mass'.
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It is the weighted average mass of an atom of an element compared to one twelfth of the mass of a carbon-12 atom.
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What is a covalent bond?
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A chemical bond that involves the sharing of electron pairs between atoms.
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What is a chemical reaction?
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A process that leads to the transformation of one set of chemical substances to another.
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What do we call substances that speed up chemical reactions without being consumed?
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Catalysts.
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