name the elements of group 17 give their electronic configuration explain why fluorine shows only an oxidation state of 1 in its compounds which halogen has a tendency to form cation
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group 17 elements:
Fluorine
chlorine
bromine
iodine
astatine
tenessine
The fluorine atom has no d-orbitals in its valence shell and therefore, cannot expand its octet. Thus, fluorine is the most electronegative and exhibit –1 oxidation state only. Fluorine does not have d-orbital while other halogens have d-orbitals. Therefore fluorine always exhibit only one oxidation state of -1 and others in halogen family shows +1, +3, +5 and +7 oxidation states.
Iodine has tendency to form cation.
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