The metal that shows the highest and maximum number of oxidation states is:

$A$ metal $M$ has the electronic configuration $M: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$. To which block does this metal belong?

The atomic radii from $Cr$ to $Cu$ are almost identical because of:

Which of the following ions is colourless in spite of the presence of unpaired electrons?

Although $Cr^{3+}$ and $Co^{2+}$ ions have the same number of unpaired electrons,the magnetic moment of $Cr^{3+}$ is $3.87 \ BM$ and that of $Co^{2+}$ is $4.87 \ BM$. Why?

Which of the following is the heaviest metal?