As you go down a group the elements generally become (more/less) metallic.

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

How manyatoms of mercury are in 1.4214e+1 ml sample