A species that is isoelectronic with the nitrate ion and hence would have the same shape is [1] [2] [3] [4] [5] sulphur trioxide sulphite ion phosphine, PH: water chlorite ion

Question

Dana Cunningham

Chemistry

21 October, 15:10

A species that is isoelectronic with the nitrate ion and hence would have the same shape is [1] [2] [3] [4] [5] sulphur trioxide sulphite ion phosphine, PH: water chlorite ion

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Keaton Branch · Answer 1

[1] sulphur trioxide

Explanation:

Isoelectronic species have the same number of valence electrons.

Valence electrons in nitrate (NO₃⁻):

5e - (N) + (3 x 6e-) (3xO) + 1e - (charge) = 24e-

Valence electrons in sulphur trioxide (SO₃):

6e - (S) + (3 x 6e-) (3xO) = 24e-

Valence electrons in sulphite (SO₃²⁻):

6e - (S) + (3 x 6e-) (3xO) + 2e - (charge) = 26e-

Valence electrons in phosphine (PH₃):

5e - (P) + (3 x 1e-) (3xH) = 8e-

Valence electrons in water (H₂O):

6e - (O) + (2 x 1e-) (2xH) = 8e-

Valence electrons in chlorite (ClO₂⁻):

7e - (Cl⁻) + (2 x 6e-) (2xO) + 1e - (charge) = 20e-

The only species isoelectronic with nitrate is sulphur trioxide. Both have trigonal planar geoemetry.