What would have been the initial pressure reading of a sample of oxygen gas that started at 25.0 ml in volume and was compressed to 15.0 ml? the final pressure reading was 1.90 atm. (temperature was kept constant.)

can you attach a picture of the lettuce? : )

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.