Electron Configuration Exceptions

Question 1

What elements have the d⁴ electronic configuration exception?

Answer 1

Chromium (Cr), [Ar] 4s¹ 3d⁵

Molybdenum (Mo), [Kr] 5s¹ 4d⁵

Question 2

What elements have the d⁹ exception?

Answer 2

Copper (Cu) [Ar] 4s¹ 3d¹⁰

Silver (Ag) [Kr] 5s¹ 4d¹⁰

Gold (Au) [Xe] 6s¹ 5d¹⁰

Roentgenium (Rg) 7s¹ 6d¹⁰

Question 3

When we ionize transition metals the leaving electrons come from the s or d orbitals?

Answer 3

S orbitals.

Question 4

What is the electron configuration of Fe²⁺?

Answer 4

[Ar} 4s⁰ 3d⁶

Question 5

What is the electron configuration of Fe?

Answer 5

[Ar] 4s² 3d⁶

Question 6

What is the electron configuration of Fe⁺?

Answer 6

[Ar] 4s¹ 3d⁶

Question 7

What is the electron configuration of Fe³⁺?

Answer 7

[Ar] 4s⁰ 3d⁵