Question

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

Options

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

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

Explanation:

To Pauli’s Exclusion Principle no two electrons should possess the same set of four quantum numbers. Thus the two electrons present in the 2s orbital have spin quantum numbers ms but of opposite sign.