Question

How to make a chemical formula by the valencies of elements ?​

Answer 1

Explanation:

When writing formula, the positive atom or ion comes first followed by the name of the negative ion. The chemical name for common table salt is sodium chloride. The periodic table shows that the symbol for sodium is Na and the symbol for chlorine is Cl. The chemical formula for sodium chloride is NaCl.

Answer 2

Answer:

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. If one of the numbers is already one, then they cannot be divided and simplified any further.
• F - write the formula