CHEM

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Which of the following elements has the highest first ionization energy?

Element then radius (pm):

X = 105pm

Y = 175pm

Z = 274pm

I think that the answer is "Z-274pm", but I just would like to make sure.

  • CHEM -

    yes, correct.

  • CHEM -

    Z wasn't correct.

    Element Z has a larger radius than elements X and Y. Because the outer electrons of element Z are not attracted as tightly to the nucleus as the outer electrons of elements X and Y, we can expect element Z to have a lower first ionization energy than elements X and Y.

    would it be: element X then: X=105pm?

  • CHEM -

    Yes, element X has the highest IP1. The largest diameter has the lowest IP and the lowest diameter has the highest IP.

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