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- #Class 11
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- #s- Block Elements ( Alkali and Alkaline earth metals )
- #National Eligibility Cum Entrance Test
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Which alkali metal has the least ionisation enthalpy?
Option: 1
Na
Option: 2
K
Option: 3
Rb
Option: 4
Cs
Answers (1)
Ionisation enthalpy of the alkali metals are considerably low and it decreases as we move down the group from Li to Cs. The effect of increasing number of shells down the group outweighs the increasing nuclear charge and thus the outermost electron is very loosely bounded to the nucleus. Hence, lesser energy is required to remove the electron from its outermost shell.
Therefore, Cs has the least ionisation enthalpy.
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