What is the formula unit for the combination of calcium and sulfate

Ca 2 Su this is the answer

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

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).