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Here are the answer to 2021-2022 Review HW for Electron Configuration and Periodic Table.
1a) 3rd energy level
1b) 2 valence electrons (ve-): electron configuration [Ne]3s2
2) [He]2s1: 1ve-
3) [Ne]3s23p1: 3ve-
4) [He]2s22p5: 7ve-
5) [Ne]3s23p4: 6ve-
6) d-block and f-block elements