What is the charge on the chromium ion in the ionic compound that has the formula Cr_2O_3?

1 Answer
Jun 28, 2017

+3

Explanation:

A compound has a zero net charge. so

2 xx Cr + 3 xx O = 0

Oxygen O almost always has a charge of -2 so

2 xx Cr + 3 xx (-2) = 0

2 xx Cr + -6 = 0 add + 6 to both sides

2 xx Cr + -6 +6 = 0 + 6 so

2 xx Cr = +6 divide both side by 2

2/2 xx Cr = + 6/2 equals

Cr = + 3