What is the wavelength range, in nanometer, for infrared light? in what portion of this range does the earth receive ir from the sun? what are the wavelength limits for the thermal ir range?

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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.