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Question

Ionization potential increases across a period, from left to right?


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Solution

Definition for Ionization potential

Ionization potential is the energy required to remove an electron completely from an isolated gaseous atom.

  • Ionization potential increases with decrease in atomic size and increase in nuclear charge.
  • From left to right in the periodic table, atomic size decreases and effective nuclear charge increases.
  • There is a strong force of attraction between the valence electron and the nucleus.
  • So greater energy is required to remove an electron from its valence shell.
  • Therefore, ionization potential increases.

Conclusion

Ionization potential increases from left to right in a period due to decrease in size and increase in effective nuclear charge of an isolated gaseous atom


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