Can some one answer b c for me

Neither model is able to show the reactivity of potassium.

That depends. cause the owl finished it in one lick

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).