Why does this structure make sense? 10. Why does this structure make sense? Why does this structure make sense? 12. Why does this structure make sense?

254 9. Sulfite ion, SO 3 2- , consists of one sulfur atom and three oxygen atoms. In the Lewis structure, the central sulfur is bonded to three oxygen atoms by single bonds. The sulfur atom has one unshared pair of electrons and each oxygen atom has three unshared pairs. Being a particle with a net charge of 2-, SO 3 2- is classified as a polyatomic anion and the 2– charge is written to the upper right side of brackets drawn around the structure. Sulfur and oxygen combine to form several different compounds and polyatomic ions including SO 2 , SO 3 , SO 3 2- , SO 4 2- , and S 2 O 3 2- . The Lewis structure of SO 3 2- is drawn as: GO TO QUESTION 9 Æ 10. Hydrogen hypoiodite, HOI, contains a hydrogen atom, an oxygen atom, and an iodine atom. In the Lewis structure, the atoms are held together by single bonds, in the order of hydrogen, oxygen, and then iodine. The oxygen has two unshared pairs of electrons while the iodine has three. Being a particle with no net charge and having all electrons in pairs, HOI is classified as a molecule. The oxygen and iodine obey the octet rule with eight electrons, but hydrogen always observes the rule with only two. The Lewis structure of HOI is drawn as: GO TO QUESTION 10 Æ : O : : O S O : .. .. .. .. .. .. 2– H O I : .. .. .. .. 9. Why does this structure make sense? 10. Why does this structure make sense? 11. Carbon dioxide, CO 2 , is made of one carbon and two oxygen atoms. In the Lewis structure, the central carbon is bonded to two oxygen atoms by a double bond to each. The oxygen atoms each have two unshared pairs of electrons. Being a particle with no net charge and having all electrons in pairs, CO 2 is classified as a molecule. Sulfur and selenium, elements in group 6A, the oxygen family, also bond with carbon in a similar fashion to form CS 2 and CSe 2 , respectively. The Lewis structure of CO 2 is drawn as: GO TO QUESTION 11 Æ 12. The bromine tetrafluoride ion, BrF 4 - , contains a bromine atom and four fluorine atoms. In the Lewis structure, the central bromine, with two unshared pairs of electrons, has a single bond to each fluorine, each of which has three unshared pairs of electrons. Being a particle with a net charge of 1–, BrF 4 - is classified as a polyatomic anion and the 1– charge is written to the upper right side of brackets drawn around the structure. Having four bonds and two unshared pairs of electrons in this ion, the large bromine atom exceeds an octet. The Lewis structure of BrF 4 - is drawn as: GO TO QUESTION 12 Æ O C O .. .. .. .. : F : F : Br F : : F : .. .. .. .. .. .. 11. Why does this structure make sense? 12. Why does this structure make sense? 255 13. The triiodide ion, I 3 - , consists of three iodine atoms. In the Lewis structure, the three atoms are arranged in a row, with single bonds connecting them and three unshared pairs of electrons on each. Being a particle with a net charge of 1-, I 3 - is classified as a polyatomic anion and the 1– charge is written to the upper right side of brackets drawn around the structure. Like other large period 5 elements with d orbitals available for bonding, iodine is capable of exceeding an octet. The Lewis structure of I 3 - is drawn as: GO TO QUESTION 13 Æ 14. Nitryl fluoride, NO 2 F, contains one fluorine atom, one nitrogen atom, and two oxygen atoms. In the Lewis structure, the central nitrogen is bonded to the fluorine with a single bond, to one oxygen with a single bond, and to the other oxygen with a double bond. The fluorine has three unshared pairs of electrons. The singly-bonded oxygen also has three unshared pairs, and the doubly-bonded oxygen has two unshared pairs. Being a particle with no net charge and having all electrons in pairs, NO 2 F is classified as a molecule. Chlorine, like fluorine of group 7A, forms a similar molecule with nitrogen and oxygen, NO 2 Cl. The Lewis structure of NO 2 F is drawn as: GO TO QUESTION 14 Æ : I I I : .. .. .. .. .. : F N O : : O : .. .. .. .. 13. Why does this structure make sense? 14. Why does this structure make sense?