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  4. A pair of electrons present between two identical non-metals

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Q. A pair of electrons present between two identical non-metals

Chemical Bonding and Molecular Structure

Solution:

According to the Gallis scale The non-polar covalent bond forms when the electronegativity difference between two atoms is zero. it means that both atoms will be identical and the electron pairs will equally share between both atoms.
Gallis scale is given below: where column-1 shows a difference in electronegativity and column-2 shows the consequence of it.
$0$ Non polar covalent bond
$0-1.6$ Polar covalent bond
$1.7$ 50 percent covalent, 50 percent ionic
$1.7-3.3$ Mainly Ionic