Question

Question #02ca3

Answer 1

5 atoms

Explanation:

The subscripts (2 and 3) in `Fe_2O_3` indicate the number of atoms (or really, in this case, ions).

There are 2 `Fe^(3+)` ions and 3 `O^(2-)` ions.

`2+3 = 5` therefore there are five atoms in one 'unit' of this compound.

To back this up, in the ball and stick model above, there are five dots; one for each atom.

Hope this helps!