6-3.1 - VESPR, Lewis Structures, Electron Pair Number, Steric Number, and Hybridization

what does VSEPR mean?

valence shell electron pair repulsion

electrons influence structural geometry by….

minimizing electron pair repulsion

do lone pairs or bonded pairs take up more space?

lone pairs

lone pairs take up ____ space because ____

more, they are bound only to central atom

what is the formula for steric number?

lone pairs + bonded pairs

what elements are “short on octet“ exceptions? (names not symbols, alphabetical order)

aluminum, beryllium, and boron

elements in group 2 ____ have an _______

never, expanded octet

elements from ____ and _____ (with exception) can have expanded octet

group 3, below

______ and ____ are always _____

hydrogen, fluorine, “terminal” atoms

these three elements are never short on an octet (alphabetical order, no symbol)

carbon, nitrogen, and oxygen

steric number 2 has what hybridization?

sp

steric number 3 has what hybridization

sp2

steric number 4 has what hybridization

sp3

steric number 5 has what hybridization

sp3d

steric number 6 has what hybridization

sp4d

diatomic molecules of the same element is polar or nonpolar?

nonpolar

diatomic molecules of different element is polar or nonpolar?

polar

when is the lewis structure symmetrical?

when no lone pairs and all noncenter atoms same

double and triple bonds contribute +___ to the steric number?

1

a symmetrical lewis structure means that the molecule is….

nonpolar

2 bonds and 0 lone pairs makes what shape?

linear

lone pairs take up _____ space than bonded pairs

more

3 bonds and 0 lone pairs make what angle?

120

4 bonds and 0 lone pairs make what angle?

109.5

what are two cases that make the molecular polar?

lone pairs and different noncenter atoms

what 3 elements (alphabetical order, no symbols) very rarely have a short octet?

carbon, nitrogen, oxygen

oxygen typically likes to have ___ bonds and ___ lone pairs

2, 2