Question

Electronic configuration of copper can be represented as:

• A. \( [Ar] 4s^1 3d^{10} \)
• B. \( [Ar] 4s^2 3d^9 \)
• C. \( [Ar] 4s^2 3d^9 4p^1 \)
• D. \( [Ar] 4s^2 3d^{10} 4p^1 \)

Hint:

Remember that some transition metals, like copper, have exceptions to the typical electron filling order for added stability. This is why \( 4s^1 3d^{10} \) occurs instead of \( 4s^2 3d^9 \).

Answer 1

The Correct Option is A

Copper (Cu) has an atomic number of 29, so its electron configuration will be \( [Ar] 4s^1 3d^{10} \). The typical configuration would involve filling the \( 4s \) orbital first and then the \( 3d \), but copper has an exception where the \( 4s \) orbital only has 1 electron to ensure the stability of the \( 3d^{10} \) configuration. Thus, the correct electronic configuration of copper is \( [Ar] 4s^1 3d^{10} \).