What is the chemical symbol for potassium?

The chemical symbol for potassium is "K." This designation comes from the Latin name for potassium, "kalium," which is why it does not correspond directly to the first letter of its English name. The "+" sign in the answer indicates that this is the ionized form of potassium, known as the potassium ion, which carries a positive charge. Potassium ions are essential for various bodily functions, including nerve transmission and muscle contraction.

In the context of the other choices, "P+" represents phosphorus, "Na+" stands for sodium, and "Ca++" denotes calcium. None of these symbols correspond to potassium itself, making the option with "K+" the only correct representation for the chemical symbol of potassium and its ionic form.