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Is H2Se Polar or Nonpolar?
Hydrogen selenide is similar to water and H2S, with a very sharply bent geometry (91°). The electronegativity difference between Se (2.55) and H (2.20) is small (0.35), making each bond only slightly polar. The bent shape prevents cancellation, but the overall dipole is only 0.24 D — much smaller than water.
Why is H2Se Polar?
Hydrogen selenide is similar to water and H2S, with a very sharply bent geometry (91°). The electronegativity difference between Se (2.55) and H (2.20) is small (0.35), making each bond only slightly polar. The bent shape prevents cancellation, but the overall dipole is only 0.24 D — much smaller than water.
- Electronegativity difference: Se (2.55) is significantly more electronegative than H (2.2), creating partial charges on each atom and making the individual bonds polar.
- Bent shape (91°): The asymmetric molecular geometry means the bond dipoles point in directions that do not cancel — they add up to produce a net dipole moment of 0.24 D.
- Net dipole moment (0.24 D): Any molecule with a nonzero net dipole moment is classified as polar. The 0.24 D dipole moment of H2Se confirms its polar character.
Molecular Geometry of H2Se
H2Se has a bent molecular geometry with a bond angle of 91°. Here is why this shape determines polarity:
- The central atom's electron pairs arrange themselves to minimize repulsion, resulting in the bent shape.
- The 91° bond angle creates an asymmetric arrangement — the bond dipoles point in directions that do not perfectly oppose each other.
- Asymmetry is the key: if H2Se had a perfectly symmetric geometry, its bond dipoles would cancel and the molecule would be nonpolar. The bent shape prevents this cancellation.
Electronegativity and Polarity
Electronegativity measures how strongly an atom attracts bonding electrons. A difference greater than ~0.5 on the Pauling scale generally means the bond is polar.
In H2Se:
- Se (central atom) electronegativity: 2.55
- H (outer atom) electronegativity: 2.2
- Difference: 0.35 — below the ~0.5 threshold, so the Se–H bonds are only weakly polar
The combination of polar bonds and an asymmetric bent geometry means the partial charges do not cancel — making H2Se a polar molecule with a net dipole of 0.24 D.
Is H2Se Polar or Nonpolar? (Quick Answer)
H2Se (Hydrogen Selenide) is polar. H2Se is a polar molecule because its bent geometry and the slight electronegativity difference between selenium and hydrogen produce a small dipole of 0.24 D.
Frequently Asked Questions
Is H2Se polar or nonpolar?
H2Se is a polar molecule because its bent geometry and the slight electronegativity difference between selenium and hydrogen produce a small dipole of 0.24 D.
Why is Hydrogen Selenide polar?
Hydrogen selenide is similar to water and H2S, with a very sharply bent geometry (91°). The electronegativity difference between Se (2.55) and H (2.20) is small (0.35), making each bond only slightly polar. The bent shape prevents cancellation, but the overall dipole is only 0.24 D — much smaller than water.
What is the shape of H2Se?
H2Se has a bent molecular geometry with a bond angle of 91°. This shape results in an asymmetric charge distribution and a net dipole moment of 0.24 D, making the molecule polar.
Does H2Se have a dipole moment?
Yes. H2Se has a dipole moment of 0.24 D. Its bent geometry and polar bonds combine to produce a net dipole, confirming its polar character.