The Inner Transition Elements (f- Block)

The video tutorial provides an in-depth look at f-block elements, focusing on lanthanoids and actinoids. It explains their classification, electronic configurations, and unique properties such as lanthanoid contraction and oxidation states. The tutorial also covers general properties like color and conductivity, and discusses the magnetic properties of these elements. The lanthanoids are highlighted for their variable oxidation states and the stability of their electronic configurations.

Which of the following elements is not considered an f-block element due to its electronic configuration?

• Gadolinium

• Cerium

• Lutetium

• Lanthanum

At which element does the filling of the 4f orbital begin in the lanthanoid series?

• Neodymium

• Lanthanum

• Cerium

• Praseodymium

What is the general electronic configuration for lanthanoids?

• Xe 5d1 4fn

• Xe 5f1 4fn

• Xe 6s2 4fn

• Xe 6p1 4fn

What is the primary reason for the lanthanoid contraction?

• Decrease in nuclear charge

• Increase in nuclear charge

• Poor shielding by f-electrons

• Effective shielding by f-electrons

Which oxidation state is most stable for lanthanoids?

• +2

• +3

• +4

• +5

Why are some lanthanoids colored in their ionic form?

• Due to fully filled d-orbitals

• Due to partially filled f-orbitals allowing f-f transitions

• Due to empty d-orbitals

• Due to fully filled f-orbitals

Which lanthanoid ions are not paramagnetic?

• Pr 3-plus and Nd 3-plus

• Ce 4-plus and Yb 2-plus

• La 3-plus and Lu 3-plus

• Sm 3-plus and Eu 3-plus