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  4. How does the ionisation energy of 1 textst group elements vary ?

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Q. How does the ionisation energy of $ 1^{\text{st}} $ group elements vary ?

AMUAMU 2019

Solution:

Ionisation energy of $1^\text{st}$ group elements decreases down the group because in groups from top to bottom atomic size increases. Due to increase in atomic size, the nuclear attraction of outer electron is reduced. They easily removed from valence orbital. So, ionisation energy is reduced from top to bottom in a group.