Coordination no. of K is

Coordination number is also known as ligancy, of a central atom in a molecule or crystal refers to the total number of atoms, ions or molecules bonded to the atom.
The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. For molecules and polyatomic ions, the coordination number is determined by simply counting the other atoms to which it is bonded.
The coordination no. of potassium is 12.