3) For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the heavier isotope is the more abundant one. a. 63Cu and 65Cud. 79Br and 81b. 85Rb and 87Rbe. 14N and c. 10B and 114) What is the empirical formula for benzene, C6H6?Br15NBa.CHd.CH3b.C6H6e.C6Hc.C2H25) Which has more mass, 1 g of CO2gas or 1 g of CO gas?6) Titanium forms different ionic oxides. One, TiO2is a white oxide used in paints. What is the proper name for TiO2?7) Which statement about a balanced chemical reaction equation is always correct?