Using first the customary ruler and then
the metric ruler, measure the length of
the side of the wooden block.
Remember to estimate to one place
value beyond the rulers' gradations.
inches
centimeter

what is the question here. i think you messed up.

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.