Which two elements on the periodic table are in the same period? A: Sn and Rb

B: F and Cl

C: K and Ba

D: Se and Te

It conforms what ever surface its in.

It is sure ( overimitation)

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).