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To write the chemical formula for any compound, we need to know the valency of the elements which form the compound.

Valency is the combining capacity of an element, i.e. the capacity of an atom to chemically unite with a definite number of atoms of other elements. The combining capacity of the atoms of the elements that is explained is an attempt to attain a fully-filled or octet configuration of outermost shell .

Boron has a valency of 3 and carbon has a valency of four; since the outermost shell has 3 and 4 electrons respectively. Since fluorine has 7 electrons in the outermost orbit it loses one electron to attain the octet configuration. So the valency of fluorine is 1.


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