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Class 12 Tuition > Learn Chemistry > The order of decreasing ionization enthalpy in alkali...
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The order of decreasing ionization enthalpy in alkali metals is (a) Na > Li > K > Rb (b) Rb < Na < K < Li (c) Li > Na > K > Rb (d) K < Li < Na < Rb

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Option:C, Ionisation enthalpy decreases down the group due to decrease in attraction of nucleus on valance electrons as down the group distance increases between nucleus and valence electrons.
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Ans is C...bec , while moving from top to bottom in the periodic table the ionic size increases so the amount of energy required to remove one electron from outer most shell decreases....hence the trend
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