Why do calcium and magnesium float on the surface of the water?

According to Archimedes’ principle the objects which are denser than water they immersed in the water. Calcium and magnesium both are solids and denser than water then what happened to both of these metals when they are drawn into the water, at the start both of them dived into the water but at once comes out and float on the surface of the water, actually, it is not a phenomenon. It is a chemical reaction of water with both of the metals calcium and magnesium. Calcium and magnesium both are very reactive substances, the reaction of water with calcium and magnesium releases hydrogen gas, this hydrogen gas sticks  all-around on the surface of the both of the metals in the form of bubbles, and the overall density of the calcium and magnesium become lesser than water, it is that’s why calcium and magnesium come out on the surface of the water.

Reaction of calcium and magnesium with water:

The reaction of calcium and magnesium with cold water and hot water:

The reaction of calcium and magnesium with cold water and hot water: A thin layer of hydrogen gas in the form of bubbles all around the piece of metals and their hydroxides are formed when the reaction takes place with cold water, this reaction stops in a while. The reaction of calcium and magnesium with hot water also produces the same products but the reaction exists for a long time since the hydroxides of calcium and magnesium dissolved in the hot water.

Although in nature calcium and magnesium don’t exist in free states because both of them are very reactive substances therefore calcium and magnesium always exist in the form of their compounds.

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