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Can u Plz explain circled point .. under the topic ionisation energy ... Would be a grt help ..

Can u Plz explain circled point .. under the topic ionisation energy ... Would be a grt help ..

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Grade:11

1 Answers

Umakant biswal
5349 Points
7 years ago
@ navdeep 
The first ionisation energy will decrease as you will move down the group . 
REASON 
1- ionisation energy is governed by charge of nucleaus . 
2- the amount of screening by the inner electrons , 
3- the distance between the outer electrons and the nucleaus . 
As u will move down the group , the increase in the nuclear charge is exactly offset by the increase in the number of inner electrons . 
here , the outer electrons feel a net attraction of 1+ from the center , 
as we go down the group , the distance between the nucleaus and the outer electrons increase so, they become easier to remove , 
thatswhy the frst ionisation energy fails . 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..

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