chemical formula
is a group of symbols that show the ratio of elements ina compund
A chemical formula is a representation of a chemical substance using symbols for the elements present in it. The formula indicates the number of atoms of each element in a molecule, compound or ion. For example, the chemical formula for water is H2O, indicating that it consists of two hydrogen atoms and one oxygen atom. The formula for carbon dioxide is CO2, indicating that it consists of one carbon atom and two oxygen atoms. Chemical formulas are generally written using the symbol of the element along with a subscript number to indicate how many atoms of that element are present in the substance.
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