For alkali metals, which one of the following trends is incorrect ?

Options

A. Hydration energy : `LigtNagtKgtRb`
B. Ionization energy : `LigtNagtKgtRb`
C. Density : `LiltNaltKltRb`
D. Atomic size : `LiltNaltKltRb`

Answer

C

Explanation

Density gradually increase on moving down from Li to Cs . Potassium is, however, lighter than sodium. The abnormal value of potassium is due to unusual increase in atomic size, i.e., atomic volume.