how many electrons ,protrons and neutrons will be there in the given element aX ,also calculate the valancy
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Number of neuton = Mass number - Atomic number
As fluorine has 9 electron, the electronic distribution is 2,7. There are seven valence electron present in the outermost shell. As valence electron is above 4, therefore valency is 1 (Valency = 8-valence electron).
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