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 prefix for the first element.

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

You have not identified the first element correctly.

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

You did not correctly indicate the number of times the first element appears.

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

The ending of the second non-metal must be changed to "--ide."

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