Use the periodic table to write the electron configuration for barium (Ba) in noble-gas notation. Ba: [__]6s²

Exothermic,  physical change after it is already baked

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).

The water cycle increase the water content in the earth atmosphere

I’m not sure about this question