An element's atomic number is 81. how many protons would an atom of this element have? protons

Which factor is likely to impact the possible number of compounds ?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

Calcium carbonate decomposes at high temperatures to give calcium oxide and carbon dioxide as shown below. caco3(s) cao(s) + co2(g) the kp for this reaction is 1.16 at 800°c. a 5.00 l vessel containing 10.0 g of caco3(s) was evacuated to remove the air, sealed, and then heated to 800°c. ignoring the volume occupied by the solid, what will be the mass of the solid in the vessel once equilibrium is reached?