Question

Out of Li, Be, Mg, Al, P and Cl which have completely filled and half-filled orbitals consequently

large ionisation enthalpies .​

Answer 1

Answer:

li,al,p,cl these have half filled orbitals

be,mg these have fully filled orbitals

Answer 2

To find:

Out of Li, Be, Mg, Al, P and Cl, Which have completely filled and half-filled orbitals consequently large ionisation enthalpies ?

Calculation:

• Always remember that half-filled and full-filled orbitals are very stable, hence in order to remove an electron from the stable condition, a large of heat is required. That's why the IONISATION ENTHALPY will be high.

$\boxed{ \therefore \: Li \bigg|_{3} \implies \: 1 {s}^{2} 2{s}^{1} }$

$\boxed{ \therefore \: Be \bigg|_{4} \implies \: 1 {s}^{2} 2{s}^{2} }$

$\boxed{ \therefore \: Al\bigg|_{13} \implies \: 1 {s}^{2} 2{s}^{2}2 {p}^{6}3 {s}^{2} 3 {p}^{1} }$

$\boxed{ \therefore \: P\bigg|_{15} \implies \: 1 {s}^{2} 2{s}^{2}2 {p}^{6}3 {s}^{2} 3 {p}^{3} }$

$\boxed{ \therefore \: Cl\bigg|_{17} \implies \: 1 {s}^{2} 2{s}^{2}2 {p}^{6}3 {s}^{2} 3 {p}^{5} }$

• So, Li (Lithium) , P (Phosphorus) have half filled orbitals.

• So, Be (Beryllium) has full-filled orbitals.