An atom of helium-4 differs from an atom of lithium-7 in that the atom of helium-4 has?

Nonmetal are moldable and easily shaped

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).