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 ....
$(A), (C)$ and $(D)$ only
$(A)$ and $(B)$ only
$(A)$ and $(C)$ only
$(A), (B)$ and $(C)$ only
The correct order of decreasing third ionisation enthalpy of $Ti, \,V,\, Cr,\, Mn$ is
Metal used for making joints in jewellery is
${[Sc{({H_2}O)_6}]^{3 + }}$ ion is
Which of the following statements is not true in regard to transition elements
On heating $Mn{(OH)_2}$ with $Pb{O_2}$ and conc. $HN{O_3}$ pink colour is obtained due to the formation of