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define ionic bonding
the electrostatic force of attraction between oppositely charged ions formed by the transfer of electrons
metals lose electrons → positive
non-metals gain electrons → negative
name ionic formulas and their charges
sulfate → SO4 2-
hydroxide → OH -
ammonium → NH4 +
nitrate → NO3 -
carbonate → CO3 2-
state and explain 4 properties of ionic compounds
high melting point
strong electrostatic forces require lots of energy to overcome
don’t conduct when solid
ions locked in fixed ionic lattice → cant move to carry charge
conducts when molten/aqueous
ions become free to move + carry charge
(some) soluble in water
water’s polar nature allows its partially charged molecules to attract + break apart the oppositely charged ions in a lattice
state the factors affecting the strength of an ionic bond
the charge
higher difference in charge = stronger electrostatic force of attraction
size
smaller ions can pack closer together → stronger attraction