6 + (3 x 6) = 24. Lewis Structure of SO3 Valence: Here, sulfur in the center because of its lowest electron capability, and three oxygen around it. That means; SO3 has 24 valence electrons. SO3 is nonpolar and this is because of the trigonal planar shape of sulfur trioxide. I think where you are going wrong is in your count of bonding electrons. VSEPR Theory: VSEPR theory defines the shape of any particular molecule. Answer Save. 0. reply. Shape of a SO3 (2-) ion? SO3 ⇒ 3 bond pairs ⇒ sp2 hybrid ⇒ trigonal planar. Anyone? Not what you're looking for? Relevance. figure it out by finding number of electrons in valence orbitals of … Gaseous SO3 is a trigonal planar molecule of D3h symmetry, as predicted by VSEPR theory. SO3 has molecular mass (32x1+16x3)= 80. Go to first unread Skip to page: Stranded Badges: 11. Rep:? 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. As far as I can work it out, I think it should be pyramidal? 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. google it. 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? It is prepared on an industrial scale as a precursor to sulfuric acid, and is also known as sulfuric anhydride. Shape of SO3(2-) ion... Watch. it shares its 6 electrons with 3 o atoms . BrF3 ⇒ 3 bond pairs, 2 lone pairs ⇒ sp3d hybrid ⇒ T-shaped (SiO3)2- ⇒ 3 bond pairs ⇒ sp2 ⇒ trig. For calculating hybridisation count the no. Announcements Applying to uni? 1 decade ago. Hybridization of SO3 is sp2. Favorite Answer . that is, equal to 0.25 moles of it. sulphur is sp3d2 hybridised so so3 has trigonal bypyramidal shape So, 20g of SO3 is equal to 20/80 moles of SO3. 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.. because sulphur is central atom in this molecule .s has 6 unpaired electrons in its v alence shell ,including its exited electrons . 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. Page 1 of 1. tjs282. 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. Find the Molecular Geometry of (SO3){eq}^{2-} {/eq}. Find your group chat here >> start new discussion reply. 1 Answer. i feel that its not trigonal planar its trigonal pyramidal . plan. Sulfur brings 6, and oxygen brings 3 each. Lv 6.