Chemistry


Chapter : 3. Atoms & Molecules

Rules for writing a chemical formula

Rules for writing a chemical formula
We first write the symbols of the elements which form the compound
Below the symbol of each element, we write down its valency.
Finally, we cross-over the valencies of the combining atoms. That is, with first atom we write the valency of second atom (as a subscript); and with the second atom we write the valency of first atom (as subscript).
Example.

Example.

Example.


Example.

Example.

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