Calculate the amount of heat evolved (in kJ) when 13.4 L of SO2 at STP and 15.0 L of O2 at 18˚C at 1.02 atm are
combined. The balanced chemical equation for this reaction follows:
2 SO2 (g) + O2 (g)  2 SO3 (g) ΔH = —198 kJ

uranium-238 i believe is your answer

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.