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9 February, 07:12

Ionization energies decrease going from li to na to k. this is because

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  1. 9 February, 11:11
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    Solution:

    ˙When we go down in periodic table, atomic radii increase.

    As atomic radius increases, the Coulomb force, which binds electron to nucleus, decreases.²

    This means that it takes less energy to rip an electron from the atom (ionize it).

    This is the required reason.
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