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

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Zef for an electron in a 2s orbital is ths same is Zef for an electron in a 2p orbital

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

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

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

answer is D.

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Detailed Solution

(a) Electrons in 2s and 2p orbitals have different screening effect.Hence, their Zeff is different.Zeff of 2s orbital> Zeff of Z p orbitalTherefore, it is not correct.(b) Energy of 2s orbital < energy of 2p orbitalHence, it is not correct.(c) Zeff of ls orbital ≠ Zeff of 2s orbitalHence, it is incorrect.(d) For the two electrons of 2s orbital, the value of ms is +12 and -12. Hence, it is correct

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