what is the chemical formula for nickel (iii) oxide?\no nio\no ni₃o\no nio₃\no ni₂o₃

Answer:

D. $Ni_2O_3$

Explanation:

Step1: Determine ion charges

Nickel(III) has a charge of $+3$ ($Ni^{3 +}$), oxygen in oxides has a charge of $- 2$ ($O^{2-}$).

Step2: Use charge - balance

To balance the charges, we need 2 nickel(III) ions ($2\times(+3)= + 6$) and 3 oxygen ions ($3\times(-2)=-6$). So the formula is $Ni_2O_3$.