Chemical Bonding and Molecular Structure - Result Question 113
####116. The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is
(a) 3
(b) 4
(c) 1
(d) 2
[2006]
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Solution:
- (d) Electronic configuration of the molecule according to molecular orbital theory, is
$\sigma 1 s^{2} \sigma^{} 1 s^{2} \sigma 2 s^{2} \sigma^{} 2 s^{2} \sigma 2 p_z^{2}(\pi 2 p_x^{2}=\sigma 2 p_y^{2})$
$ (\pi^{} 2 p_x^{2}=\pi 2 p_y^{2}) \sigma^{} 2 p_z^{2} \sigma 3 s^{2} \sigma^{*} 3 s^{2} \sigma 3 p_z^{2} $
$(\pi 3 p_x^{2}=\pi 3 p_y^{2})(\pi^{*} 3 p_x{ }^{1}=3 p_y{ }^{1})$
Last two electrons are unpaired. So no. of unpaired electron is 2 .
