For clouds to form, water vapor in the air must condense and change from gas to liquid. What must water molecules do as part of this process

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C) electrons encircling a nucleus with neutrons and protons

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).