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Ch. 8 – Flashcard

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La calse de
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Matalloids
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have properties in common with both metals and nonmetals often used as semiconductors in electronic devices.
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Nonmetals
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poor conductors of thermal energy and electricity, most are gases at room temperature
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Metals
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often shiny, good conductors of electricity and thermal energy:
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Chemical bonds
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is a force that holds two or more atoms together.
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Valence Electrons
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is an outermost electron of an atom that participates in chemical bonding. Valence electrons have the most energy of all electrons in an atom. These outermost electrons are the only electrons involved in chemical bonding.
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Electron Dot Diagram
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a model that represents valence electrons in an atom as dots around the element's chemical symbol.
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Covalent Bond
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is a chemical bond formed when two atoms share one or more pairs of valence electrons. The atoms then form a stable covalent compound.
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Molecule
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is a group of atoms held together by covalent bonding that acts as an independent unit.
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Chemical Formula
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is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound.
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Ion
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an atom that is no longer electrically neutral because it has lost or gained valence electrons.
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Ionic Bond
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an atom that is no longer electrically neutral because it has lost or gained valence electrons.
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Ionic Bond
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the attraction between positively and negatively charged ions in an ionic compound.
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Metallic Bonds
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is a bond formed when many metal atom share their pooled