Q8 of 53 Page 125

The order of decreasing ionisation enthalpy in alkali metals is

Ionization enthalpy is the energy required to displace an electron from the valence shell of an atom in ground state. The smaller the size of the atomic radii, more energy is required to separate the valence electron. In the given metals, the size of the atomic radii in decreasing order is Li > N > K > Rb. The correct option is (iii).

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