9 of 43© Boardworks Ltd 2009 Trends in electronegativity Electronegativity of the halogens decreases down the group due to an increase in atomic radiu
{"Image DocumentName": "Trends in electronegativity", "Image ImageDescription": "Boardworks AS Chemistry. Halogens. Electronegativity of the halogens decreases down the group due to an increase in atomic radius. Increased nuclear charge has no significant effect because there are more electron shells and more shielding. Iodine atoms therefore attract electron density in a covalent bond less strongly than fluorine. Teacher notes. See the \u2018Bonding and Intermolecular Forces\u2019 presentation for more information about electronegativity and its relationship to atomic radius and shielding. fluorine atomic radius = 42 \u00d7 m electronegativity = 4.0. iodine atomic radius = 115 \u00d7 m electronegativity = 2.5.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}