Explain the deviation in ionisation enthalpy of some elements from the general trend by using the given figure:
Explain the deviation in ionisation enthalpy of some elements from the general trend by using the given figure:

Solution:

Ionization enthalpy of elements varies through period and group. As we move from left to right in a period, the ionization enthalpy increases and lowers when we move down a group.

  1. Effective nuclear charge on the outermost electrons.
  2. Electron-electron repulsion force.
  3. Stability of the element due to half-filled and filled orbitals are some of the parameters affected.