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Question

Ionization potential increases over a period from left to right because the:


A

Atomic radius increases and nuclear charge increases

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B

Atomic radius decreases and nuclear charge decreases

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C

Atomic radius increases and nuclear charge decreases

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D

Atomic radius decreases and nuclear charge increases

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Solution

The correct option is D

Atomic radius decreases and nuclear charge increases


  • We know that in the periodic table from left to right in a particular period, the atomic size decreases, and the effective nuclear charge increases. These make the outermost electrons of an atom more closely bound to its nucleus.
  • Therefore more energy is required to remove a valence electron from an atom as we go to the right side of a period.
  • Therefore ionization potential increases over a period from left to right.

So the correct option is D.


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