How many elements are represented in the formula CaCO3

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1

The solubility of barium nitrate is 9.02 g/100 g h2o at 20°c. a 15.2 g sample of barium nitrate is added to 200.0 g of water at 20°c. is the solution saturated, unsaturated, or supersaturated? a. unsaturated b. saturated c. supersaturated