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Solution


Q.

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is  [2025]
1 8  
2 9  
3 1  
4 10  

Ans.

(3)

Element Cr Fe Co Ni
Ionization enthalpy (kJ/mol) 397 416 425 430

 

Cr has lowest enthalpy of atomization among given options.

Cr24=[Ar]183d54s1

Cr has 6 valence electrons.