객관식
Which of the following elements has the highest first ionization energy?
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10. Periodic Properties of the Elements
Periodic Trend: Ionization Energy
객관식
Which of the following elements is predicted to have the greatest (most endothermic) first ionization energy?
A
Na (sodium)
B
Li (lithium)
C
K (potassium)
D
Ne (neon)
검증된 단계별 안내1
Understand that the first ionization energy is the energy required to remove one electron from a neutral atom in the gas phase.
Recall the general trend in the periodic table: ionization energy increases across a period (left to right) and decreases down a group (top to bottom).
Identify the positions of the given elements: Na, Li, and K are all alkali metals in Group 1, with Li at the top, Na below it, and K further down the group.
Recognize that Neon (Ne) is a noble gas located at the end of the second period, which means it has a full valence shell and a very stable electron configuration.
Conclude that because Ne has a full octet and is at the right end of the period, it will have a much higher (more endothermic) first ionization energy compared to the alkali metals, which have only one valence electron and are more willing to lose it.
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