Give reason for the following briefly :- 1. Why does the first ionization enthalpy for titanium less than vanadium ???
2. Why does iron have higher first ionization enthalpy than that of cobalt ????. 3. Why does Nickel have lower 1st ionization enthalpy than that of cobalt......?????????

1. Vanadium has low ionisation enthalpy than Titanium is the correct statement. (Kindly check your question). The reason is Vanadium has the electronic configuration [Ar]3d34s 2, which often changes to [Ar]3d5. Due to this transition the electrons are loosely held and its easy to remove. Whereas Titanium has [Ar]3d​2 4s2, which need more energy to remove the electron as there is no such transition take place as in the case of V.
2. Iron have higher first ionisation enthalpy than cobalt, due to the sceening effect. Fe has [Ar]3d64s and Co has [Ar]3d74s. More the d electrons the shielding is more and the electrons are lost immediately. 

3. Nickel has lower ionisation enthalpy than that of cobalt. ​The reason is Nickel has the electronic configuration [Ar]3d84s 2, which often changes to [Ar]3d10. Due to this transition the electrons are loosely held and its easy to remove. Whereas cobalt has [Ar]3d74s2, which need more energy to remove the electron as there is no such transition take place as in the case of Nickel.

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