Which of the following best describes the trend in the amount of energy released on addition of an e — Atomic Structure Chemistry Question
Question
Which of the following best describes the trend in the amount of energy released on addition of an electron to the gas-phase atoms (electron affinity) of the group 1 and group 2 elements in the same period?
A.
More energy is released by the group 1 elements because there is less electron-electron repulsion in the ions.
B.✓ Correct
More energy is released by the group 1 elements because the added electron enters an s orbital rather than a p orbital.
C.
More energy is released by the group 2 elements because they have more protons in the nucleus.
D.
More energy is released by the group 2 elements because addition of an electron to a group 1 element disrupts an unusually stable half-filled s subshell.
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