Question

question 6 (1 point)
which electron configuration is allowed in consideration of hunds rule?
1s²2s²2p⁶3s²3p⁴4s²
1s²2s²2p⁶3s²
1s²2s²2p⁴3s²
1s²2s²2p⁶3s²3p⁶4s¹3d²

Explanation:

Step1: Recall Aufbau principle

Electrons fill orbitals in order of increasing energy: \(1s < 2s<2p < 3s<3p < 4s<3d\)

Step2: Analyze each option

• For \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}4s^{2}\): After filling \(3p\) (which can hold up to 6 electrons), \(4s\) should be filled before \(3p\) is completely filled. So this is incorrect.
• For \(1s^{2}2s^{2}2p^{6}3s^{2}\): Follows the Aufbau principle (\(1s\) filled first, then \(2s\), then \(2p\), then \(3s\)).
• For \(1s^{2}2s^{2}2p^{4}3s^{2}\): \(2p\) can hold 6 electrons. We should fill \(2p\) completely (\(2p^{6}\)) before moving to \(3s\). So this is incorrect.
• For \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{2}\): \(4s\) should be filled completely (\(4s^{2}\)) before filling \(3d\). So this is incorrect.

Answer:

\(1s^{2}2s^{2}2p^{6}3s^{2}\)