When cl2 reacts with excess of f2 clf3 is formed and not fcl3?
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Chlorine has empty 3d orbitals. It has electronic configuration of 3s2 3p5. It can promote its 3p electrons to empty 3d orbitals so that it can have more half filled orbitals to accomodate 3 Fluorine atoms around it.
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F cannot show positive oxidation state as it has highest electronegativity Because Fluorine cannot expand its covalency due to absence of d- orbital. As Fluorine is a small sized atom, it cannot pack three large sized Cl atoms around it.
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