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8.1-8.2

Across
a compound that is composed of molecules
a molecule consisting of two atoms
a bond formed when two atoms share a pair of electrons
a pair of valence electrons that is not shared between atoms
a neutral group of atoms joined together by covalent bonds
a covalent bond in which one atom contributes both bonding electrons
a chemical formula that shows the arrangement of atoms in a molecule or a polyatomic ion; each dash between a pair of atoms indicates a pair of shared electrons
a tightly bound group of atoms that behaves as a unit and has a positive or negative charge
one of the two or more equally valid electron dot structures of a molecule or polyatomic ion
a covalent bond in which three pairs of electrons are shared by two atoms
Down
a bond formed by the sharing of electrons between atoms
the energy required to break the bond between two covalently bonded atoms; this value is usually expressed in kJ per mol of substance
a bond in which two atoms share two pairs of electrons