List the two factors that affect ionic bond formations. Describe the trends of one of these factors in the periodic table.
Please help.

Cationic radius.

Charge density.

Explanation:

Across the period, cationic radius is almost constant and charge density increases due to increase in charge magnitude, hence increase decrease in ionic character.

Down the group, cationic radius increases and charge density is constant, hence decrease in charge density which increases the ionic character.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."