1 D and F Block Elements
A transition element X has a configuration $$[Ar]3d^4$$, in its +3 oxidation state. Its atomic number is:
1) 25 2) 26 3) 22 4) 19
In +3 oxidation state $$[Ar]3d^4$$ So in metallic state $$[Ar]3d^5 4s^2$$ and metal is Mn (25).
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