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groups 1 and 2 are s, groups 3-12 are d, and groups 13-18 are p. The inner transition elements that are placed separately are part the f subshell. Within the groups, you can count the numbers in to determine the subscript
If you remember the blocks on the periodic table as previously mentioned, you can write the electron configuration of the elements. You mostly need to remember that the electrons will fill up the smaller shells first until all the orbitals are full and then will expand to larger shells.
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