If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element?

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for example fluorine is a non metal atom.its atomic number is 9.its electronic configuration is 2, here the no. of valence electrons is find the valency for fluorine atom or any other atom which is 5 or more than 5,just subtract the number from 8.          sodium-atomic number=11 electronic configuration is 2,8,1                             here valence electrons is 1.valency is 1.bcz,the valency does not exceed 5

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