Grade 12Inorganic Chemistry
The highest number of unpaired electrons are present in A.fe0 B.fe2+ C.fe3+ D.fe4+
The highest number of unpaired electrons are present in
A.fe0 B.fe2+ C.fe3+ D.fe4+
1 Answer
Arun
Fe has an electronic structure of [Ar] 4s2 3d6
The 4s orbital is full so any unpaired electrons will be in the 3d subshell - placing 6 electrons in the five 3d orbitals following Hund's rule gives us four unpaired electrons for the Fe
When Fe forms a 2+ ion the 4s electrons are lost first to give [Ar] 3d6 - the number of d electrons has not changed so there are still four unpaired electrons
To for the 3+ one more electron is lost to give [Ar] 3d5 - thus there will be five unpaired electrons.
The 4s orbital is full so any unpaired electrons will be in the 3d subshell - placing 6 electrons in the five 3d orbitals following Hund's rule gives us four unpaired electrons for the Fe
When Fe forms a 2+ ion the 4s electrons are lost first to give [Ar] 3d6 - the number of d electrons has not changed so there are still four unpaired electrons
To for the 3+ one more electron is lost to give [Ar] 3d5 - thus there will be five unpaired electrons.
Hence correct answer is C
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