Which of the following metal ions is diamagnetic?
- A$Co^{2+}$
- B$Ni^{2+}$
- C$Cu^{2+}$
- D$Hg^{2+}$
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In the $3d$ series of the $d$-block elements,which element has the maximum atomic size?
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$La$ (lanthanum) having atomic number $57$ is a member of
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View SolutionOut of all the known elements,the percentage of transition elements is approximately $......\%$
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