An element having the electronic configuration $[Ar]3d^24s^2$ belongs to
- A$s-$ block elements
- B$p-$ block elements
- C$d-$ block elements
- D$f-$ block elements
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The correct order of ionic radii of trivalent ions $Y^{3+}$,$La^{3+}$,$Eu^{3+}$,and $Lu^{3+}$ is $(Y=39, La=57, Eu=63, Lu=71)$.
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The electronic configuration of chromium is
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View SolutionWhich one of the following ions will be colourless in an aqueous solution? (Atomic numbers: $Sc = 21, Fe = 26, Ti = 22, Mn = 25$)
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