8.23 Without referring to a periodic table, write the electron configuration of elements with the following atomic numbers: (a) 9, (b) 20, (c) 26, (d) 33. Classify the elements. 8.27 Write the ground-state electron configurations of the following ions: (a) Li*, (d) F¯, (g) Se2-, (k) Sn2+, (n) Pb²+. 8.29 Write the ground-state electron configurations of the following transition metal ions: (a) Sc3+, (b) Ti4+, (c) V5+, (d) Cr3+, (e) Fe2+, (f) Fe3+

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