When two electrons are placed in two degenerate orbitals of the atom, the energy is lower if their spin is parallel. The statement is based upon :

Pauli's exclusion

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Bohr's rule

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Hund's rule

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Aufbau principle

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Solution

The correct option is A Hund's rule
According to Hund's rule electrons are distributed among the orbitals of subshell in such a way as to give maximum number of unpaired electron with parallel spin, i.e. in a subshell pairing of electron will not start until and unless all the orbitals of that subshell will get one electron each with same spin.

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1 s^{7}

1 s^{2} 2 s^{2} 2 p^{3} . Y e t, 1 s^{7}

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

(a) $Z_{e f f}$ for an electron in a 2s orbital is the same as $Z_{e f f}$ for an electron in a 2p orbital

(b) An electron in the 2s orbital has the same energy as an electron in the2p orbital

(d) The two electrons present in the 2s orbital have spin quantum number $m_{s}$ but of opposite sign

H

- \frac{R_{H}}{4}

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