For the electrons of oxygen atom, which of the following statemetns correct?

Options

A. `Z_(eff)` for an electron in a 2s orbital is the same as `Z_(eff)` for an electron in a 2p
B. An electron in the 2s orbital has the same energy as an electron in the 2p orbital
C. `Z_(eff)` for an an electron in 1s orbital is the same as `Z_(eff)` for an electron in a 2s orbital
D. The two electrons present in the 2s orbital have spin quantum numbers `m_(s)` but if opposite sign

Answer

D

Explanation

(a) Electron in 2s and 2p orbitals have different screen effect. Hence, their Zeff is different
Zeff of 2s orbital `gt` Zeff of 2p orbital. Therefore, it is not correct.
(b) Energy os 2s orbital `lt` energy of 2p orbital Hence, it is not correct.
(c) Zeff of 1s orbital `ne` Zeff of 2s orbital Hence, it is incorrect.
(d) For the two electrons of 2s orbital, the valuw of `m_(s)` is `+(1)/(2)` and `-(1)/(2)` Hence, it is correct.