A 2.5 L gas in a cylinder fitted with a movable piston is originally at 25 °C and 1.00 atm pressure. The gas is then subjected to a pressure of 0.85 atm at the same temperature. The final volume of the gas is L.

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.