Is SiS2 polar or nonpolar? – (Polarity of SiS2)

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The question is –

Is SiS2 polar or nonpolar?


SiS2 is non-polar.  


Silicon disulfide (SiS2) is non-polar as the dipole moments of individually polar Si=S bonds get canceled equally in opposite directions in the linear molecular shape and geometry.

SiS2 consists of two Si=S double covalent bonds.

Each Si=S bond is slightly polar as an electronegativity difference of 0.39 units exists between a silicon (E.N = 2.19) and a sulfur (E.N = 2.58) atom.

Oppositely charged dipoles develop in the molecule as the central Si-atom gains a partial positive charge (δ+) while each of the terminal S-atoms gains partial negative charges (δ).

There is no lone pair of electrons on the central Si-atom in SiS2.

Thus, no distortion is witnessed in its shape and/or geometry.

Hence the SiS2 molecule occupies a linear molecular shape.

The oppositely-directed Si=S dipole moments get canceled equally in the symmetrical linear shape to yield an overall non-polar SiS2 molecule (net µ = 0).

is sis2 polar or nonpolar

Also, check –

How to identify polar or nonpolar compounds?

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