Question #02ca3

1 Answer
Dec 4, 2017

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!