The element in which electrons are progressively filled in 4f - orbital are called
(a) actinoids (b) transition elements (c) Lanthanoids (d) halogens

Q. The elements in which electrons are progressively filled in $4f$ orbital are called:

Q. In a transition series, the orbital in which number of electrons differ element to element is/are:

Q. Assertion :The difference in the successive oxidation states exhibited by transition elements is unity only Reason: d orbitals of transition elements are incompletely filled

Q. The elements of the three transition series of the d - block are given below:
$\begin{array}{cccccccccc}& & & & & & & & & \\ Sc& Ti& V& Cr& Mn& Fe& Co& Ni& Cu& Zn\\ Y& Zr& Nb& Mo& Tc& Ru& Rh& Rd& Ag& Cd\\ La& Hf& Ta& W& Re& Os& Ir& Pt& Au& Hg\end{array}$
In any transition series, as we move form left to right, the d - orbitals are progressively filled and their properties vary accordingly.
Which element do you expect to have the smallest atomic radius?

Q. The elements of the three transition series of the d - block are given below:
$\begin{array}{cccccccccc}& & & & & & & & & \\ Sc& Ti& V& Cr& Mn& Fe& Co& Ni& Cu& Zn\\ Y& Zr& Nb& Mo& Tc& Ru& Rh& Rd& Ag& Cd\\ La& Hf& Ta& W& Re& Os& Ir& Pt& Au& Hg\end{array}$
In any transition series, as we move form left to right, the d - orbitals are progressively filled and their properties vary accordingly.
Which element do you expect to have the highest melting point?