Answer:
Ni 3+ and CO3 2− (ion with variable charge)
cation (with roman numeral for charge) and then the first anion
Ni2(CO3)3
nickel(III) carbonate
Al2 3+ CO3 2- (regular polyatomic ionic)
cation and the first anion with "ate" ending
Al2(CO3)3
Aluminium Carbonate
Step-by-step explanation: