Question

what is periodic law? write the molecular formula of magnesium chloride and calcium bicarbonate (pls help fast)​

Answer 1

similar properties recur periodically when elements are arranged according to increasing atomic number. similar properties recur periodically when elements are arranged according to increasing atomic weight.

Thus, the formula of magnesium chloride is MgCl2. Thus, the formula of calcium oxide is CuO. Thus, the formula of copper nitrate is Cu(NO3)2. Thus, the formula of calcium carbonate is CaCO3.