Question

explain the factors influencing ionisation energy.

Answer 1

Factors Influencing Ionization Enthalpy

The ionization enthalpy of an atom depends on the following factors.

As the distance between the electron and the nucleus increases, i.e., as the size of the atom increases, the outermost electrons are less tightly held by the nucleus.

Answer 2

$\sf \: (i) \large {\underline {\blue { \: Ionisation \: energy : - }}}$

It is the minimum amount of energy required to remove an electron from the outermost shell of an neutral gaseous atom.

$\sf \: (ii) \large {\underline {\green{\sf { \: Factors \: affecting \: Ionisation \: energy : - }}}}$

• Atomic Radius/Atomuc size
• Effective nuclear charge
• screening effect/shielding effect
• Penetration of atomic orbitals
• charge on the ion
• stable electronic configuration

$\sf \: (iii) \large {\underline {\orange{ \: Succesive \: Ionisation \: Energies : - }}}$

• ........ > IE₄ > IE₃ > IE₂ > IE₁

$\sf \: (iv) \: \large {\underline {\red{ \: Some \: relations : - }}}$

• $\large \sf \: atomic \: radius \: \: \alpha \: \: \: \dfrac{1}{Ionisation \: energy}$

• $\large \sf \: effective \: nuclear \: charge \: \: \: \alpha \: \: \: Ionisation \: energ$

• $\large \sf \: shielding \: effect \: \: \alpha \: \: \: \dfrac{1}{Ionisation \: energy}$

• $\large \sf \: penetration\: of \: orbitals \: \: \: \alpha \: \: \: Ionisation \: energy$