Ask a Teacher

anomalous properties of fluorine ? need as seminar

Fluorine differs from rest of the elements of its family due to (i) its small size (ii) highest electronegativity, (iii) low bond dissociation energy and (iv) absence of d-orbitals in the valence shell. The main points of difference are :

(1) Fluorine is most reactive of all the halogens due to lower value of F — F bond dissociation energy (F₂ = 158, Cl₂ = 243, bromine = 192 and iodine = 151 kJ mol^–1) .

(2) Being the most electronegative element, it shows only an oxidation state of –1 and does not show positive oxidation states due to absence of d-orbitals in its valence shell. Other halogens show positive oxidation states of +1, +3, +5 and +7.