Question

Which among the following is the lightest metal?

Answer 1

Answer:

Explanation:

The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.

Two other metallic elements are less dense than water. Potassium has a density of 0.862 g/cm3 while sodium has a density of 0.971 g/cm3. All of the other metals on the periodic table are denser than water.

While lithium, potassium, and sodium are all light enough to float on water, they are also highly reactive. When placed in water, they burn or explode.