Answer

  1. In the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed.

Explantion:

O2 = (8 + 8) = 16.

$\sigma1\text{s}^{2}<\sigma^{*}1\text{s}^{2}<\sigma2\text{s}^{2}<\sigma\text{s}^{2}<\sigma2\text{s}$ 

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