Related Questions
Which element has the electronic configuration ?
Eu
Gd
Tb
Dy
Which element is the exception to the generally non-radioactive nature of lanthanides?
Cerium (Ce)
Promethium (Pm)
Europium (Eu)
Gadolinium (Gd)
The most common oxidation state exhibited by actinides is:
+2
+3
+4
+5
The lanthanoids contraction relates to
Atomic radii
Atomic as well as radii
Valence electrons
Oxidation states
Which of the following is a lanthanoid?
Ta
Rh
Th
Lu
Lanthanides are known for their characteristic +3 oxidation state. Which of the following statements contradicts this established behavior?
They readily form +3 ions.
They exhibit variable oxidation states, though +3 is most common.
They readily form -3 ions.
Their +3 ions often exhibit color due to f-f transitions.
All of the following are general characteristics of lanthanides EXCEPT:
They are typically trivalent.
They have high electronegativity.
They have large atomic and ionic sizes.
They are silvery-white metals.
After the removal of three electrons from a Gadolinium atom, the resulting ion achieves a stable electronic configuration that is:
Half-filled 4f subshell
Fully-filled 4f subshell
Half-filled 5d subshell
Fully-filled 5d subshell
The energy difference between 5f, 6d, and 7s orbitals plays a crucial role in the oxidation states of actinoids. How does this energy difference influence the range of oxidation states observed?
Larger energy difference leads to a wider range of oxidation states.
Smaller energy difference leads to a wider range of oxidation states.
Energy difference has no impact on the range of oxidation states.
Energy difference only affects the stability of the +3 oxidation state.
Which phenomenon explains why the expected increase in atomic radius from period 5 to period 6 is less pronounced for the elements following the lanthanides?
lanthanide contraction
shielding effect of d-electrons
relativistic effects
ionization energy trend
