Explain, in terms of electrons, why the radius of a potassium atom is larger than the radius of the potassium ion in the ground state.

Apotassium atom has 4 electrons in valance shell while potassium ion has 3 electrons in a electron shell. a k ion has one fewer electrons than k atom. that is  why the radius of a potassium atom is larger than the radius of the potassium ion in the ground state.

Enzyme make a hormone as a catalyst