The Nature of Covalent Bonding – Flashcards
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When atoms share electrons to gain the_______configuration of a noble gas, the bonds formed are covalent
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stable electron
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A______pair of valence electrons constitutes a single covalent bond
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shared
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Pairs of valence electrons that are not shared between atoms are called________
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unshared pairs
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Pairs of valence electrons that are not shared between atoms are called________
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unshared pairs
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Sometimes two or three pairs of electrons; this is a________
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double/triple
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In some cases, only one of the atoms in a bond provides the pair of bonding electrons; this is a_________
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coordinate covalent bond
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_______is required to break the bond between two covalently bonded atoms
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Energy
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The total energy required to break the bond between two covalently bonded atoms is known as the___________
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bond dissociation energy
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When it its possible two wrote two or more valid electron dot formulas for a molecule or ion, each formula is referred to as a ______
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resonance structure
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The modern interpretation of resonance is that electron pairs rapidly flip back and forth between the various electron dot structures
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Not true
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The compound NH3 contains two double covalent bonds
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Always True
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The chemical formulas of molecular compounds show the number and type of atoms in each molecule
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Sometime true
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A molecule of bromine has six unshared pairs of electrons
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Not true
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Carbon forms four single covalent bonds with other atoms
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Always true
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A bond in which one atom contributes both bonding electrons is called polyatomic covalent bond
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Not true
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two atoms held together by sharing a pair of electrons
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Single covalent bond
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represents the covalent bonds by dashes and shows the arrangement of covalently bonded atoms
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Structural formula
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a pair of valence electrons that is not shared between atoms
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Unshared pair
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a bond that involves two shared pairs of electrons
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Double covalent bond
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a bond formed by sharing three pairs of electrons
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Triple covalent bond
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a covalent bond in which one atom contributes both bonding electrons
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Coordinate covalent bond
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a tightly bound group of atoms that has a positive or negative charge and behaves as a unit
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Polyatomic ion
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the energy required to break the bond between two covalently bonded atoms
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Bond dissociation energy
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one of the two or more equally valid electron dot structures of a molecule or polyatomic ion
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Resonance structure
