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For the electrons of oxygen atom, which of the following statements is correct?

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Z_eff for an electron in a 2s orbital is the same as Z_efffor an electron in a 2p orbital

An electron in the 2s orbital has the same energy as an electron in the 2p orbital

Z_eff for an electron in 1s orbital is the same as Z_eff for an electron in a 2s orbital

The two electrons present in the 2s orbital have spin quantum numbers m_s but of opposite sign.

answer is D.

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Detailed Solution

Electrons in 2s and 2p orbitals have different screening effects. Hence, their Z_eff. is different. Therefore, (a) is not correct.

Energy of 2s<2p. Hence, (b) is not correct.

For reason similar to that of (a), (c) is also not correct.

The two electrons in any orbital have spin quantum numbers with opposite sign. Hence, (d) is correct

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