Question

6. Revise chemical symbols and valencies​

Answer 1

Explanation:

To write the chemical formula for a compound it is best to use the S.V.S.D.F system. S - write down the symbols of both the elements involved. V - beneath each symbol, write it's valency. S - swap the valencies over. D - if the valencies can be simplified, divide them both by the smaller of the two numbers.