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

1 Answer
Jun 28, 2017

Answer:

+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#