What was Thomson's model of the atom called? A. The oil-drop model
B. The photoelectric model
C. The plum-pudding model
D. The atomic theory model

Ithink that’s it’s b

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).