The electronic configuration of a transition element in +3 oxidation state is [Ar] 3d7. Find out its atomic number.
The atomic number of Argon is 18.
It is also given that the oxidation state of the element is +3.
Therefore the atomic number of the element is given by:
= Atomic Number of Argon + 7 + 3
= 18 +10
= 28
Therefore the element is Nickel.
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