
Often we can compare properties of two elements based solely on periodic trends. For which pair of elements is the periodic trend not sufficient to determine which has the higher first ionization energy?

Interpretation:
A pair of elements is to be identified, which cannot be compared on the basis of ionization enthalpy by using the periodic trend.
Concept introduction:
Effective nuclear charge increases across a period and
It is more difficult to remove a paired core electron (electron from the inner shells) than an unpaired valence electron.
Ionization energy tends to increase across a period and decreases down the group.
Answer to Problem 1KSP
Correct answer: Option (b).
Explanation of Solution
Reason for correct option:
For the elements,
Hence, option (b) is the correct answer.
Reason for incorrect options:
Option (a) is incorrect because
Option (c) is incorrect because
Option (d) is incorrect because
Option (e) is incorrect because
Hence, options(a), (c), (d), and (e) are incorrect.
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Chapter 7 Solutions
Chemistry
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