Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

The Left Exponents must be balanced on both sides of the equation arrow. The Left Subscripts must also balance. The new element symbol results from the new lower left atomic number.

The Left Exponents must be balanced on both sides of the equation arrow. The Left Subscripts must also balance. The new element symbol results from the new lower left atomic number.