In Which of the Following Ways Is Lithium Different from the Other

Multiple Choice

In which of the following ways is lithium different from the other alkali metals?

A) Its salts are much more soluble in water than those of the other alkali metals.
B) It has an unusually high density.
C) It forms molecular compounds with the hydrocarbon groups of organic halides.
D) Its ionization energy is lower than expected.
E) It does not react with water at room temperature.