Transcript Polarizability - University of California, Irvine

Polarizability
• More electrons are
further from the nucleus
NaCl
MgI2
• Nucleus has less pull on far
off electrons
• The more electrons the
more “polarizability”
• More negative charge
equals more polarizability
• i.e. Br- is more polarizable
than Cl-.
Polarizing Power
NaCl
MgI2
• Small highly charged
cations can polarize
atoms easier.
• Higher charge= tighter
control over electrons
• Small= tighter control over
electrons.
• I.E.
• Al3+ can polarize another
atom better than Na+
Polarizing Power and Covalent Character
• Covalent Character vs.
Ionic Character
NaCl
MgI2
• Higher polarizing power
with higher polarizability
yields
• Which has more covalent
character, MgI2 or NaCl,
why