As the principal quantum number increases, the difference of distance of separation between consecutive energy levels :
A
Decreases.
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B
Remains the same.
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C
Increases.
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D
Sometimes increases and sometimes decreases.
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Solution
The correct option is C Increases. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.