Question

Correct order of enthalpy of atomisation of mn, fe, nu, co

Answer 1

Fe, Co, Ni, Mn is the increasing order of atomization of enthalpy.

Explanation:

The enthalpy of atomization is defined as enthalpy change occurring in the separation of all the atoms from a lattice of metal.

Enthalpy accounts to total heat energy  in a system, enthalpy changes when chemical forms transition takes place.

The enthalpy of atomization is dependent on the number of unpaired electrons. The greater is number of electrons the higher will be atomization enthalpy. The more strong is the metallic bonding more is the enthalapy of optimization.

The metals with atomic number 25(Mn), 26(Fe), 27 (Ni), Co (28) has unpaired electrons which causes strong metallic bonds.

Mn= 1s22s22p63s23p64s23d5

Fe=1s2s22p63s23p64s23d6

Ni= 1s22s22p63s23p64s23d8

Co= 1s22s23p64s22p63s23p64s23d7

the d block elements have unpaired electrons in their d orbital  because of which nuclear charge is more, hence energy of atomisation is more.

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