Which of the following metallic elements is denser than water?

Correct option is C

The correct answer is (c) Calcium.
· Calcium is a metallic element that is denser than water. The density of calcium is approximately 1.55 g/cm³, while water has a density of 1 g/cm³.
· This means calcium will sink in water, making it denser. On the other hand, the other elements listed—potassium, sodium, and lithium—are all alkali metals with densities lower than that of water, meaning they would float if placed in water.
Additional Knowledge:
· Potassium: Less dense than water, with a density of 0.86 g/cm³.
· Sodium: Less dense than water, with a density of 0.97 g/cm³.
· Lithium: The lightest metal, with a density of 0.53 g/cm³, much less dense than water.