They are called "formulas" (Latin formulae) and show what elements and ions are in the compound. The formula H2O for water shows that a water molecule is made of two atoms of hydrogen and one of oxygen.
The symbols representing chemical compounds are called chemical formulas. They can be expressed as an empirical formulawhich shows the simplest ratio of atoms in the compound, or a molecular formula which shows the actual number of each atom in the compound, or as a structural formula which shows the spatial relationship of the atoms.
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If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".
Variables
That is called algebra.That is called algebra.That is called algebra.That is called algebra.
The example is simple.Consider a board marker.It is written on it that which compounds are used to manufacture it..To know such information is called qualitative analysis.Now if we try to know the %age of these compounds then it is called quqntitative.
Actually the symbols and lines are called hexagrams.