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Cards In This Set
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Atom
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Basic unit of matter
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Describe nucleus of an atom
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Center of an atom; formed by strong forces of protons and neutrons; made up of protons and neutrons
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Proton
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Positively charged; inside nucleus
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Neutron
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Neutral charge; inside nucleus
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Electron
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Negatively charged; outside nucleus
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Why are atoms neutral despite having charged particles?
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Because they have the same number of protons and electrons which cancel out
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Chemical element
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A pure substance that consists entirely of one type of atom
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Atomic number
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Number of protons in an atom
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Isotopes
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Atoms of the same element that differ in the number of neutrons they contain; identified as mass numbers
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Why do all isotopes of an element have the same chemical properties?
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Because they have the same number of electrons, all isotopes of an element have the same chemical properties
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Chemical compound
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A substance formed by the chemical combination of two or more elements in definite proportions
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What does the formula for table salt indicate about that compound?
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That the elements from which table salt forms- sodium and chlorine combine in a 1:1 ratio
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Chemical bonds
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Holds atoms in compounds together
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Covalent bonds
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Formed when electrons are shared between atoms
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Ionic bond
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Formed when one or more electrons are transferred from one atom to another
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