Important question related to ionisation energy

Important question related to ionisation energy: 

Question 1
Ionisation energy of gases is higher. why?

ans.  because of higher stable of ns^2 np^6 configuration.

or

noble gases have completely filled valence shell  whuchbis more stable. so removal of electron is very difficult. hence I. E of noble gases is high.

Question 2
which have more ionisation energy Oxygen & nitrogen?

ans
O
(8)    1s^2  2s^2  2p^4

N
(7)    1s^2  2s^2  2p^3


Nitrogen has exactly half filled p subshell .whuch is more stable as a result removal electron becomes difficult. hence I. E of nitrogen is more than oxygen.

hence peaks show half filled & completely filled subshell of atom .which  required more energy for removal of electron .hence I. E is more

Question 3
First I. E of aluminum is less than magnesium. why?

ans
Al
(13) 1s^2  2s^2  2p^6  3s^2 3p^1

Mg
(12) 1s^2  2s^2  2p^6  3s^2

in aluminum we have to remove electron from 3p orbital  which required comparatively less energy .hence first I. E of aluminum is less than magnesium.


Question 4
First I. E of magnesium is higher than that of aluminum .while 2nd I. E of sodium is higher than Magnesium.

ans

Mg
(12) 1s^2  2s^2  2p^6  3s^2

Al
(13) 1s^2  2s^2  2p^6  3s^2 3p^1

in Mg  when  first electron remove its remove from the s subshell which highly stable. so we required large amount of energy to remove electron from Mg as compare to Al. so I. E(1)   is more than Aluminum of magnesium


Mg^+
(12) 1s^2  2s^2  2p^6  3s^1

Al ^+
(13) 1s^2  2s^2  2p^6  3s^2

when I. E(2)  is removed than aluminum taken more energy as compare to magnesium. so we can say that I. E(2)  of Aluminium is more than magnesium

similarly

Question 5

 I. E(1)  of magnesium is higher than that of Na while I. E(2)  of Na is higher than Mg. 

Question 6 

First ionisation energy of alkaline earth metal is low and second is higher but show deviated state (+2) ?

ans

 because hydration energy of group 2 element is large. so at The I. E(2)  when electron remove is attain more energy. so I. E (2)  is more due to hydration energy.