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I am posting a question from an MCAT General Chemistry Review Book. I hope it is ok to post the question considering copyright and such.
The question is:
What is the expected trend in the first ionization energies of cadmium, indium, and tin?
My answer (Increasing ionization energy): Cd, In, Sn
My reasoning: Ionization energy trend: Increasing from left to right and up the table.
Sn, has smallest atomic radius out of three three elements, therefore it is more difficult to remove electron (strong effective nuclear charge) and so HIGHEST ionization energy.
Please help!
The book has (increasing ionization energy) Sn, In, Cd
and their explanation is "Ionization energy increases with decreasing atomic radii, which occurs in a period as the effective nuclear charge increases." The only thing is….. I am pretty sure atomic radii DECREASE from left to right. So within this period (5), Cd should be larger than In and Sn.
Is this an error in the book? Do I have this concept all wrong?
** This is from a McGraw Hill Book
The question is:
What is the expected trend in the first ionization energies of cadmium, indium, and tin?
My answer (Increasing ionization energy): Cd, In, Sn
My reasoning: Ionization energy trend: Increasing from left to right and up the table.
Sn, has smallest atomic radius out of three three elements, therefore it is more difficult to remove electron (strong effective nuclear charge) and so HIGHEST ionization energy.
Please help!
The book has (increasing ionization energy) Sn, In, Cd
and their explanation is "Ionization energy increases with decreasing atomic radii, which occurs in a period as the effective nuclear charge increases." The only thing is….. I am pretty sure atomic radii DECREASE from left to right. So within this period (5), Cd should be larger than In and Sn.
Is this an error in the book? Do I have this concept all wrong?
** This is from a McGraw Hill Book
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