本题目来源于试卷: Models of Matter A.3 Electron Configurations，类别为 IB化学
[单选题]
Which statement about ionization energies is incorrect?
A. First ionization energies are always higher than second ionization energies
B. The energy required to remove electrons
C. The general trend is that first ionization energies increase across a period
D. The general trend is that first ionization energies decrease down a group
参考答案: A
本题详细解析:
Second ionization energies are higher than the first as the electrons are being removed from a positive ion resulting in a stronger electrostatic attraction.
First ionization energies do increase across a period due to increasing nuclear charge.
First ionization energies also decrease down a group due to increased shielding (number of shells).
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