Freezing point of pure water on the celsius scale is

the role of the microscope world in creating new materials .

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.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter