What happen when potassium react with cold water?

the metal melts and floats

Explanation:

When potassium is added to water, the metal melts and floats. It moves around very quickly on the surface of the water. The hydrogen ignites instantly. The metal is also set on fire, with sparks and a lilac flame.

It reacts rapidly to form a colorless solution of potassium hydroxide.

Explanation:

Potassium metal reacts very rapidly with water to form a colorless basic solution of potassium hydroxide (KOH) and hydrogen gas (H 2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.