Click the answer you think is correct.

It may be helpful to work out the correct answer with a pencil and paper before first before clicking one of the choices provided.

For another question, select one of the options from the top of the menu on the left.

If you need help, select one of the options from the bottom of the menu.

Congratulations! You have selected the correct answer.

For another question, select one of the options from the top of the menu on the left.

You have the incorrect charge on the polyatomic ion.

Please use the information shown above to select the correct answer.

The Roman numeral indicates the charge per appearance of the positive ion.

Please use the information shown above to select the correct answer.

You do not have the correct formula for the polyatomic ion.

Please use the information shown above to select the correct answer.

A Roman numeral is not used as a part of the formula for a compound.

Please use the information shown above to select the correct answer.