Name three elements which exibit variable valency?
Three elements which can exhibit variable valencies are:
Fe (+2 (FeSO4) and +3 (FeCl3)),
Mn (+2 in MnCl2 and +7 in MnO4-)
P (+3 in PCl3 and +5 in PCl5)
What is Variable Valency? Do elements exhibit variable valencies? Give examples. [3 MARKS]
What is variable valency ? Name two elements having variable valency and state their valencies.