The symbol of potassium element is:

Correct option is D

The correct answer is K.
· Potassium is a chemical element with the atomic number 19 and the symbol K (from Neo-Latin kalium).
· Potassium is a silvery-white metal that can be cut with a knife with little effort. They have low melting points and low densities.
· In seconds, potassium metal reacts with atmospheric oxygen to form flaky white potassium peroxide.
· It was first isolated from potash, or plant ashes, from which it gets its name.
· The electronic configuration of potassium is [Ar] 4s¹.
· In the periodic table, potassium is an alkali metal, which all have a single valence electron in the outer electron shell that is easily removed to form an ion with a positive charge—a cation—that combines with anions to form salts.
· In nature, potassium occurs only in ionic salts.
· Potassium ions are required for all living cells to function properly.
Uses of potassium:
· It is used as a heat exchange medium and in nuclear power plants.
· Potassium salts are a component of fertilizer.
· It is one of the most important nutrients for the human body.
· Potash can be used to make glass, soap, and a variety of other products.
· Physical and Chemical Properties of Potassium:
· It is a silky, lustrous metal and a melting point of 63°F and a boiling point of 770°F.
· Potassium is a metal that can float in water.
· It has a lavender-coloured flame and green smoke.
· It is the seventh most common element in the crust of the world.
· Potassium is a malleable metal with a silver colour profile once isolated.
· Potassium interacts aggressively with water, releasing hydrogen gas.
Additional Information
· Phosphorus is a chemical element with symbol P and the atomic number 15.
· Polonium is a chemical element with symbol Po and the atomic number 84.
· Platinum is a chemical element with symbol Pt and the atomic number 78.