The electron configuration of ₂9} Cu is

Correct Answer is : 1S2²2 2S2²2 2P6^66 3S2²2 3P6^66 4S1¹1 3d10¹0}10

1S² 2S² 2P^6 3S² 3P^6 4S¹ 3d¹0}

1S² 2S² 2P^6 3S² 3P^6 4S³ 3d^9

1S² 2S² 2P^5 3S² 3P^6 4S² 3d¹0}

1S² 2S² 2P^6 3S² 3P² 4S¹ 3d¹0}

Correct Answer is : 1S2²2 2S2²2 2P6^66 3S2²2 3P6^66 4S1¹1 3d10¹0}10

Test Index

WAEC Chemistry 2024 Paper

Question : 36

Total: 50

_{29}

Cu is

Solution:

Concept:

Copper is a transition metal that violates the Aufbau principle because a completely filled

3d

subshell is more stable than a partially filled

4s

subshell.

Explanation:

Copper has atomic number

29

, so it has

29

electrons.

The expected configuration is

1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^2\ 3d^9

However, one electron from the

4s

orbital moves to the

3d

orbital to achieve a stable, full

3d^{10}

configuration.

Therefore, the actual configuration is

1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^1\ 3d^{10}

This matches the arrangement written as

1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^1\ 3d^{10}

Answer:

Option A:

1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^1\ 3d^{10}

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