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There are four types of subshells. Each of the subshells is designated by a letter, either s, p, d or f: s subshell, p subshell, d subshell, and f subshell
s subshell: Group 1 , Group 2, hydrogen and helium d subshell: Groups 3 to 12 (transition metals) p subshell: Groups 13 to 18 f subshell: lanthanoids and actinoids
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