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

Options

A. `Z_(eff)` for an electron in a 2s orbital is the same as `Z_(eff)` for an electron in a 2p orbital.
B. An electron in the 2s orbital has the same energy as an electron in the 2p orbital
C. `Z_(eff)` for an electron in Is 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 of opposite sign.

Explanation

(A) Electrons in 2s and 2p orbitals have different screen effect. So, their `Z_(eff)` is different. `Z_(eff)` of 2s orbital `gt Z_(eff)` of 2p orbital. So, it is not correct. (B) Energy of 2s orbital `lt` energy of 2p orbital. So, it is not correct. (C) `Z_(eff)` of Is orbital `neZ_(eff)` of 2s orbital So, it is incorrect. (D) For the two electrons of 2s orbital, the value of `m_(5) is + 1/2` and -`1/2` .