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chem U7

covalent bonding

what happens to the electrons in covalent bonding electrons are shared to achieve octet and outer electron clouds overlap to release energy. only singles are stolen
sigma bond always formed first; when 2 orbitals overlap directly on the bond axis
pi bond when parallel p orbitals bend to overlap (for double and triple bonds)
covalent radius radius that is measured by dividing the internuclear distance btwn the 2 bonded atoms
van der waals radius the minimum distance btwn atoms not bonded. defined by the outer edge of the electron shell.
how is the van der waals radius found? another atom bumps against the molecule; the molecule's e- cloud repels it and pushes it out
do covalent bonds conduct electricity? no; they have no charge
do covalent bonds have a high melting pt or low melting pt? low melting pt (<500F)
covalent compound's physical state? nonbrittle solids, liquid, gas
appreance of covalent compounds dull
Created by: allyson.lee