d and f BLOCK ELEMENTS

Which electronic configuration is generally attributed to all actinoids?

• 5f¹⁴ 7s² for all
• 6d² 7s² for all
• 7s² with variable filling of 5f and 6d orbitals
• 4f¹⁴ 5d¹⁰ 7s² for all

What is the primary challenge in preparing and studying the later members of the actinoid series?

• Their high stability
• Their abundance in nature
• Their extremely short half-lives and the minute quantities in which they can be synthesized
• Their gaseous state at room temperature

What is the significance of the f⁷ occupancy in actinoid electronic configurations?

• It is always avoided
• It is unstable
• It determines the atomic mass
• It is related to electronic configuration stability

Which actinoid is specifically mentioned as having a half-life as short as 3 minutes?

• Fermium (Fm)
• Mendelevium (Md)
• Lawrencium (Lr)
• Einsteinium (Es)

What is a key difference between 5f and 4f orbitals mentioned in the text?

• 5f orbitals are more stable
• 5f orbitals are completely filled
• 5f orbitals are less buried than 4f orbitals
• 5f orbitals have lower energy