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10 Cards in this Set
- Front
- Back
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elements
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is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. Elements
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atom
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An atom is the smallest unit of matter that defines the chemical elements.
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nucleus
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the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
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protons
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The proton is a subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron.
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neutron
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a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen. neutron
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electrons
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a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
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atomic number
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the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
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atomic mass
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the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
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periodic table
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the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
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valence electrons
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The valence electrons (VE) are the electrons in the outer shell of an atom.
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