d and f BLOCK ELEMENTS

How many 3d electrons are present in the Ni^2+ ion, and how would they be expected to occupy the d-orbitals in an octahedral complex (assuming a weak field ligand like water)?

• 10 electrons; t2g^10 eg^0
• 8 electrons; t2g^6 eg^2
• 6 electrons; t2g^6 eg^0
• 8 electrons; t2g^8 eg^0

How many 3d electrons are present in the Co^2+ ion, and how would they be expected to occupy the d-orbitals in an octahedral complex (assuming a weak field ligand like water)?

• 9 electrons; t2g^9 eg^0
• 7 electrons; t2g^6 eg^1
• 7 electrons; t2g^7 eg^0
• 5 electrons; t2g^5 eg^0

What is the electronic configuration of the element with atomic number 109 (Meitnerium)?

• [Rn] 5f^14 6d^8 7s^1
• [Rn] 5f^14 6d^7 7s^2
• [Rn] 5f^13 6d^8 7s^2
• [Rn] 5f^15 6d^6 7s^2

What is the electronic configuration of the element with atomic number 101 (Mendelevium)?

• [Rn] 5f^12 6d^1 7s^2
• [Rn] 5f^14 7s^1
• [Rn] 5f^13 7s^2
• [Rn] 5f^11 6d^2 7s^2

What is the electronic configuration of the element with atomic number 91 (Protactinium)?

• [Rn] 5f^3 7s^2
• [Rn] 5f^2 6d^1 7s^2
• [Rn] 5f^1 6d^2 7s^2
• [Rn] 5f^4 7s^1