A first row transition metal in its $+2$ oxidation state has a spin-only magnetic moment value of $3.86 \mathrm{BM}$ The atomic number of the metal is

Addition of non-metals like $B$ and $C$ to the interstitial sites of a transition metal results the metal

Steel is manufactured from

In $d-$ block $3d$ series, which of the following element has maximum size ?

The ${E^\Theta }\,\left( {{M^{2 + }}/M} \right)$ value for copper is positive $(+0.34 \,V ) .$ What is possible reason for this? (Hint: consider its high $\Delta_{ a } H^{\theta}$ and low $\Delta_{ hyd } H^{\theta}$ )

Which of the following statements are correct?

$(A)$ The electronic configuration of $Cr$ is $[ Ar ] 3 d ^{5}$ $4 s^{1}$.

$(B)$ The magnetic quantum number may have a negative value.

$(C)$ In the ground state of an atom, the orbitals are filled in order of their increasing energies.

$(D)$ The total number of nodes are given by $n-2$.

Choose the most appropriate answer from the options given below ....