Is SiS2 polar or nonpolar? – (Polarity of SiS2)
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The question is –
Is SiS2 polar or nonpolar?
Answer:
⇒ SiS2 is non-polar.
Explanation:
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).
Also, check –
⇒ How to identify polar or nonpolar compounds?
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