3: bonding + VSPER theory Flashcards
ionic bonding vs covalent bonding?
= complete transfer of electron from a less EN to a more EN atom
= sharing of e= btw bonded atoms
crystal lattices are formed by strong (?), resulting in high (?) in ionic compound and short (?)
electrostatic forces / melting points / atomic radius
polar covalent molec vs nonpolar covalent? give an example for each
= unequal sharing of e- density; forms a dipole moment (H-Cl_
= more equal sharing of e- density; no net dipole moment (Cl-Cl)
how to find formal charge
N valence - N owened (lone pairs = 1/2 of bonding pairs)
3 rules to drawing Lewis structure
- central atom should be the least ∆EN
- fulfil full octet, starting from most ∆EN
- formal charge should be on most ∆EN
T OR F:
- reasonance structures differ only in location of nuclei and e-
- they are snapshots of the structures tht exist at nay given moments in time
ALL FALSE
correct reasonance structures differ only in the e- position
real structures are averages of reasonance structures; rep as reasonance hybrid
for line diagram, H atoms bonded to C while lone pair for others; in double bonds there’s 2 C
what does VSPER theory assumes?
- e- pairs occupy the valence shell of central atom
- regions of e- density repel e/o to maximize separation
- lone pairs repel more than bonding paris
- multiple bonds = 1 region
explain the dash-line-wedge symbolism?
line: on plane
dashed: away from you
wedge line: towards you
assign electronic arrangement for 2 / 3 / 4 / 5 / 6 regions
2- linear
3- trigonal planar
4- tetrahedral
5- trig bypiramidal
6- octahedral