For the electrons of oxygen atom, which of the following statements is correct?
1
Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital.
2
An electron in the 2s orbital has the same energy as an electron in the 2p orbital.
3
Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital.
4
The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite sign.
5
Question Not Attempted