Which value represents the first ionization energy of a nonmetal? (1) 497.9 kJ (2) 577.4 kJ (3) 811.7 kJ (4) 1000. kJ

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a electronegativity decreases beacuse the size of nucleus is bigger.

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.