How many columns are there in the s blocks of the periodic table

In the s block specifically theres 2 columns theres 18 columns for the whole periodic table

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).