Which six are correct?

a
Covalent bonding involves the sharing of valence electrons.
b
Covalent bonding involves the transfer of valence electrons from one atom to another.
c
Covalent bonding occurs between a metal and a nonmetal.
d
Covalent bonding occurs between two nonmetals.
e
In a nonpolar covalent bond, valence electrons are shared equally between the atoms.
f
In a nonpolar covalent bond, valence electrons are NOT shared equally between the atoms because one of the atoms has a stronger attraction for electrons.
g
In a polar covalent bond, valence electrons are shared equally between the atoms.
h
In a polar covalent bond, valence electrons are NOT shared equally between the atoms because one of the atoms has a stronger attraction for electrons.
i
The bond between phosphorous and chlorine in Phosphorous trichloride (PCl3) is an example of a covalent bond.

j
The bond between sodium and bromine in the compound Sodium bromide (NaBr) is an example of a covalent compound.

k
Atoms in a polar covalent bond have slight charges because of the unequal sharing of electrons.
l
Atoms in a nonpolar covalent bond have slight charges because of the unequal sharing of electrons.

The six correct statements are:

a) Covalent bonding involves the sharing of valence electrons.
d) Covalent bonding occurs between two nonmetals.
e) In a nonpolar covalent bond, valence electrons are shared equally between the atoms.
h) In a polar covalent bond, valence electrons are NOT shared equally between the atoms because one of the atoms has a stronger attraction for electrons.
i) The bond between phosphorous and chlorine in Phosphorous trichloride (PCl3) is an example of a covalent bond.
k) Atoms in a polar covalent bond have slight charges because of the unequal sharing of electrons.