Aufbau Principle → from lower energy orbital to higher energy orbital: s < p < d < f
Electron configuration of Fe: 1s22s22p63s23p64s23d6
How about transition metal ions? How many inner/core and outer/valence electrons are in Fe?
a) 18 inner/core and 8 outer and 8 valence
b) 28 inner/core and 2 outer and 2 valence
c) 18 inner/core and 8 outer and 2 valence
d) 18 inner/core and 2 outer and 8 valence
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