1 decade ago. sulphur is sp3d2 hybridised so so3 has trigonal bypyramidal shape SO3 has molecular mass (32x1+16x3)= 80. Sulfur brings 6, and oxygen brings 3 each. Go to first unread Skip to page: Stranded Badges: 11. because sulphur is central atom in this molecule .s has 6 unpaired electrons in its v alence shell ,including its exited electrons . google it. As SO3 has trigonal shape and sulphur is joined by each oxygen with double bonds (comprises of one sigma and one pi bond),SO IT HAS THREE SIGMA BOND. Gaseous SO3 is a trigonal planar molecule of D3h symmetry, as predicted by VSEPR theory. Relevance. Shape of SO3(2-) ion... Watch. Not what you're looking for? Anyone? Page 1 of 1. Find your group chat here >> start new discussion reply. 6 + (3 x 6) = 24. Shape of a SO3 (2-) ion? BrF3 ⇒ 3 bond pairs, 2 lone pairs ⇒ sp3d hybrid ⇒ T-shaped (SiO3)2- ⇒ 3 bond pairs ⇒ sp2 ⇒ trig. For calculating hybridisation count the no. I think where you are going wrong is in your count of bonding electrons. Hybridization of SO3 is sp2. figure it out by finding number of electrons in valence orbitals of … it shares its 6 electrons with 3 o atoms . 1 Answer. Right ok its trigonal pyramidal but i dont get how..... so had 6 + 3 + 2 added electrons so has 11 bonding electrons.....3 pairs and 5 other electrons please explain where i am wrong please. plan. tjs282. Sulfur trioxide has trigonal planar molecular geometry since all three S=O bonds are nearly double bonds and all are the same length, and energy, and are 120 degree apart. Rep:? Sulfur trioxide (alternative spelling sulphur trioxide) is the chemical compound with the formula SO 3, with a relatively narrow liquid range.In the gaseous form, this species is a significant pollutant, being the primary agent in acid rain.. Lv 6. that is, equal to 0.25 moles of it. Lewis Structure of SO3 Valence: Here, sulfur in the center because of its lowest electron capability, and three oxygen around it. It is prepared on an industrial scale as a precursor to sulfuric acid, and is also known as sulfuric anhydride. As far as I can work it out, I think it should be pyramidal? Announcements Applying to uni? VSEPR Theory: VSEPR theory defines the shape of any particular molecule. Using VSEPR theory we use the sigma bonds to establish the geometry: three bonding pairs and no … #1 Report Thread starter 14 years ago #1 ...what is it? SO3 ⇒ 3 bond pairs ⇒ sp2 hybrid ⇒ trigonal planar. SO3 is nonpolar and this is because of the trigonal planar shape of sulfur trioxide. Sulfur and oxygen have a difference in electronegativity due to which polarity arises in the S-O bond but the three S-O bonds lie at 120 degrees angle with each other cancels out the overall polarity and resulting in the formation of SO3 as a nonpolar molecule. 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