Tin has electron configuration [Kr] 5s²4d¹⁰5p² and it is not a transition element because its outermost orbitals are 5s² 5p². It has oxidation states of +2 and +4.
The electron configuration of tin is [Kr] 5s²4d¹⁰5p². The electronic structure of an atom shows the arrangement of electrons in the atom of an element. The electrons are arranged in sub-shells.
Tin is not a transition metal because it has a completely filled d sub-shell and its outermost shell consists of ns, np orbitals.
Tin looses its electrons in pairs. Remember that the outermost orbitals are 5s² 5p². This means that tin can have two stable oxidation states, +2 and +4.
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