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1.

Iodine forms I3- but F2 does not form F3- ions .why?

Answer»

Due to the presence of vacantd-orbitals,I2 accepts electrons from I- ions to form I3- ions,butbecause of absence of d-orbitals F2 does not accept electrons from Fions to form F3- ions.
Discussion
2.

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why?

Answer»

Halogens have the smallest size in their respective periods and therefore high effective nuclear charge. As a consequence, they readily accept one electron to acquire noble gas electronic configuration.
Discussion
3.

Give two examples to show the anomalous behavior of fluorine.

Answer»

Most of the reactions of fluorine are exothermic (due to the small and strong bond formed by it with other elements). It forms only one oxoacid while other halogens form a number of oxoacids. Hydrogen fluoride is a liquid (b.p. 293 K) due to strong hydrogen bonding. Other hydrogen halides are gases. 
Discussion