Chemistry 9701/12 — February/March 2022
Cambridge AS Level · Multiple Choice (AS Level) · answer key with instant marking and worked solutions
Topics Atoms, Molecules and Stoichiometry · Chemical Bonding · Atomic Structure · Reaction Kinetics · Chemical Periodicity · Introduction to Organic Chemistry · +14 more
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The first ionisation energy of potassium, K, is . The first ionisation energy of strontium, Sr, is .
Which statement helps to explain why Sr has a greater first ionisation energy than K?
Options
A The charge on a Sr nucleus is greater than the charge on a K nucleus.
B The outer electron in a Sr atom experiences greater shielding than the outer electron in a K atom.
C The outer electron in a Sr atom experiences spin-pair repulsion.
D The outer electron in a Sr atom is further from the nucleus than the outer electron in a K atom.
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