Asked Dec 24, 2019
  • Why first ionisation enthalpy of Cr is lower than that of Zn ?

Expert Answer

Step 1

Why first ionisation enthalpy of Cr is lower than that of Zn is to be explained.

Step 2

Ionization enthalpy is the amount of energy required by an isolated gaseous atom to lose an electron in is ground state.

And First ionization enthalpy of an atom is the energy needed by the atom (A) to form its ion (A+) by losing one electron.

Step 3

Electronic configuration of Cr – 1s22s22p63s23p63d54s1

Electronic configuration of Zn - 1s22s22p63s23p63d104s2

Thus, the outermost orbital is s- orbital.

Now, each and every atom wants to achieve a stable configuration i.e. a complete...

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