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Q.

Which atom has the smallest first ionization energy?

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a

Na

b

Mg

c

K

d

Ca

answer is B.

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Detailed Solution

Potassium atom has the smallest first ionization energy.

In comparison to lithium, potassium also exhibits more valence electron shielding from nuclear charge. 

Thus, it is quite simple to remove the valence electrons from potassium. 

Therefore, potassium's ionization potential is smaller than Li's ionization potential.

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