d and f BLOCK ELEMENTS

What is the ground state electronic configuration of Terbium (Tb, Z=65)?

• [Xe] 4f⁸ 6s²
• [Xe] 4f⁹ 6s²
• [Xe] 4f¹⁰ 6s²
• [Xe] 4f⁹ 5d¹ 6s¹

What is the ground state electronic configuration of Gadolinium (Gd, Z=64)?

• [Xe] 4f⁸ 6s²
• [Xe] 4f⁷ 6s²
• [Xe] 4f⁷ 5d¹ 6s²
• [Xe] 4f⁸ 5d¹ 6s¹

What is the ground state electronic configuration of Europium (Eu, Z=63)?

• [Xe] 4f⁶ 6s²
• [Xe] 4f⁷ 6s²
• [Xe] 4f⁸ 6s²
• [Xe] 4f⁷ 5d¹ 6s¹

What is the ground state electronic configuration of Thulium (Tm, Z=69)?

• [Xe] 4f¹² 6s²
• [Xe] 4f¹³ 6s²
• [Xe] 4f¹⁴ 6s²
• [Xe] 4f¹³ 5d¹ 6s¹

What is the ground state electronic configuration of Erbium (Er, Z=68)?

• [Xe] 4f¹¹ 6s²
• [Xe] 4f¹² 6s²
• [Xe] 4f¹³ 6s²
• [Xe] 4f¹² 5d¹ 6s¹