Question

Arrange the following elements in the increasing order of their first ionisation potentials, give proper explanation for your answer.
a) Li, Be, B
b) N, O, F
c) C, N, O, F

Answer 1

Arrange the following elements in the increasing order of their first ionization potentials:

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Ionization Potential is the minimum energy required to remove the electrons from the outer most shell of a neutral gaseous atom is called first Ionization Potential . It is also known as First Ionization energy.

a) Li, Be, B : 
All the elements belongs to same period.
Generally ,Along the period from left to right,Ionization Potential increases.
As Be[ 1s2 2s2] is having stable electronic configuration, its Ionization potential increases.

Increasing order : LI<B<Be

b)N, O, F 
All are 2nd period elements.
So, Along the period from left to right,Ionization Potential increases.

Nitrogen has partial half filled stable electronic configuration[1s2 2s2 2p3], so 
Increasing Order :O<N<F

c) C, N, O, F
All are 2nd period elements.
So, Along the period from left to right,Ionization Potential increases.

Increasing Order :C<O<N<F

Hope its clear
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Answer 2

Answer:

Explanation:

Ionization Potential is the minimum energy required to remove the electrons from the outer most shell of a neutral gaseous atom is called first Ionization Potential . It is also known as First Ionization energy.

a) Li, Be, B :

All the elements belongs to same period.

Generally ,Along the period from left to right ,Ionization Potential increases.

As Be[ 1s2 2s2] is having stable electronic configuration, its Ionization potential increases.

Increasing order : LI<B<Be

b)N, O, F  

All are 2nd period elements.

So, Along the period from left to right ,Ionization Potential increases.

Nitrogen has partial half filled stable electronic configuration[1s2 2s2 2p3], so  

Increasing Order :O<N<F

c) C, N, O, F

All are 2nd period elements.

So, Along the period from left to right ,Ionization Potential increases.