What is the correct order of the following elements with respect to their density ?
$Cr < Zn < Co < Cu < Fe$
$Zn < Cu < Co < Fe < Cr$
$Zn < Cr < Fe < Co < Cu$
$Cr < Fe < Co < Cu < Zn$
Correct statement for $3d-$ series is
Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason : Actinide elements are strongly paramagnetic.
While filling up of electrons in the atomic orbitals, the $4s$ orbital is filled before the $3d$ orbital but reverse happens during the ionisation of the atom. Explain why ?
Which of the following will act as best oxidizing agents
Why do the transition elements exhibits variable oxidation states?