What is a type of nuclear reaction in which the nucleus of a heavy atom splits into two or more smaller nuclei that have masses of relatively similar size? A. nuclear fusion
B. nuclear fission
C. chain reaction
D. gamma radiation

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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.