d and f BLOCK ELEMENTS

What is the melting point range for most lanthanoids?

• Between 500 to 800 K
• Between 1000 to 1200 K
• Between 1500 to 1800 K
• Above 2000 K

What happens to the hardness of lanthanoids as atomic number increases?

• Hardness increases
• Hardness decreases
• Hardness remains constant
• Hardness fluctuates randomly

What is the general appearance of lanthanoids?

• Silvery white soft metals
• Brittle grey metals
• Shiny black solids
• Colorless gases

What is the electronic configuration of Lutetium (Lu) for its Ln³⁺ ion?

• 4f¹³
• 4f¹⁴
• 4f¹⁵
• 5d¹4f¹³

What is the electronic configuration of Ytterbium (Yb) for its Ln³⁺ ion?

• 4f¹²
• 4f¹³
• 4f¹⁴
• 4f¹⁵