Problem: What are the electron configurations for the Fe3+ and S2- ions?Fe3+: 1s22s22p63s23p63d104s1    S2-: 1s22s22p63s23p6Fe3+: 1s22s22p63s23p63d104s1    S2-: 1s22s22p63s23p2Fe3+: 1s22s22p63s23p63d5           S2-: 1s22s22p63s23p6Fe3+: 1s22s22p63s23p63d5           S2-: 1s22s22p63s23p2

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Distribute electrons in the atomic orbitals:

Recall:

s           _                1 orbital

p        _ _ _             3 orbitals

d       _ _ _ _ _        5 orbitals

s orbital  can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons

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Problem Details

What are the electron configurations for the Fe3+ and S2- ions?

Fe3+: 1s22s22p63s23p63d104s1    S2-: 1s22s22p63s23p6

Fe3+: 1s22s22p63s23p63d104s1    S2-: 1s22s22p63s23p2

Fe3+: 1s22s22p63s23p63d5           S2-: 1s22s22p63s23p6

Fe3+: 1s22s22p63s23p63d5           S2-: 1s22s22p63s23p2

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