PPT-1.7: Electronegativity and bond

p olarity CHE2060 Topic 1 Atoms orbitals amp bonding Bond polarity amp electronegativity Covalent bonds can be either polar or nonpolar depending on how equally or unequally their e pair bonds are shared between the 2 bonded atoms. The ability of an atom in a molecule to attract shared electrons to itself.. Linus Pauling. 1901 - 1994. Table of Electronegativities. Higher electronegativity. Electronegativity differences determine bond type.. Unit 16. Shapes and Electrical Properties of Molecular Compounds. VSEPR . Theory (4.12). Electronegativity (4.7). Identification of Compounds as Polar or . Nonpolar. (4.13). VSEPR Theory (4.12). The geometry of molecules is important in determining some of their properties. COVALENT BOND. bond. formed by the . sharing . of . electrons . Covalent . Bonds. Between nonmetallic elements of similar electronegativity. .. Electronegativity = how badly an atom wants to add an electron (non metals have higher electronegativity). Very Important!. Going down the periodic table the properties are affected by INCREASING SIZE and INCREASING DISTANCE between the nuclei and the valence . e-s. Going across a period, properties are affected by the DIFFERING VALENCE, NUCLEAR CHARGE and CHARGE ON THE SPECIES. Polarity and Electronegativity. Think about it. What does the word POLAR mean to you?. Polar Bear North/South Poles. Polar Molecules. What is Electronegativity?. Electronegativity:. . How much an atom in a molecule attracts electrons. How does your sense of smell work? . If a molecule fits into a receptor site in your nose, should all things smell? Why do you think you don’t smell the molecules of O. 2. , N. 2. , or CO. 2. in the air? . B. onds. Polar bond -. A type of covalent bond between two atoms in which electrons are shared unequally, resulting in a bond in which one atom has a slightly negative charge and the other a slightly positive charge.. WHAT TYPE OF BOND DO ALUMINUM AND CHLORINE FORM?. AlCl. 3. Aluminum Chloride. WHAT TYPE Of BOND DO ALUMINUM AND CHLORINE FORM?. Ionic: . Metal and . NonMetal. AlCl. 3. Aluminum Chloride. WHAT TYPE Of BOND DO ALUMINUM AND CHLORINE FORM?. F. 2. yellow gas. very reactive. toxic . Cl. 2. green gas. very reactive. toxic . Br. 2. orange liquid. very reactive. toxic . often used as a solution in water - bromine water, Br. 2. (. aq. ). I. 2. Text:. Ch 8 (all except sections 4,5 & 8). Ch 9.1 & 9.5. Ch 10.1-10.7. My Name is Bond. Chemical Bond. PART 1: . Ionic & Covalent Bonding. Chemical Bonds. A chemical bond is an attraction between 2 atoms or ions.. (bring notes to show me next lesson). ;. Read pages 60 – 62 in your text book. Complete the questions at the end of each double page spread. Look at the following websites. http://www.chemguide.co.uk/atoms/bonding/electroneg.html#top. Chapter 17- How Atoms Bond and Molecules Attract The Big Idea: Atoms and molecules are sticky 17.1 Electron-Dot Structures Valence electrons= electrons in outermost shell Electron- dot structures: a series of dots surrounding an atomic symbol Polarity. The electronegativity. values of representative elements . in Group . 1A (1) to Group 7A (17). .. Learning . Goal . Use electronegativity to determine the polarity . of . a bond.. Electronegativity. . b)Electro Negativity. . . Anitha. . George Varghese. Dept. of Chemistry. Marthoma. College. ELECTRON . AFFINITY (ELECTRON GAIN ENTHALPY) . Electron gain enthalpy. . is defined as the enthalpy change taking place when an isolated .