Refer to the periodic table and write the predicted electron configuration for each of the following ions

Question:

Refer to the periodic table and write the predicted electron configuration for each of the following ions using core notation:

(a) Fe3+ 

(b) Se2–.

2 3 4 5 6 7 Li 6.94 11 1 IA Na 22.99 19 37 55 4 2 IIA 87 Be 9.01 12 K Ca 39.10 40.08 Mg 24.31 20 38 21 Rb Sr

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