• West Valley High School, Yakima

• SCIENCE 123

When atoms react to form more stable compounds, it is the unpaired valence electrons that are used to make a bond. In a covalent bond, the unpaired valence electrons are shared. When a stable molecule is made, each atom will have 8 valence electrons (except for period 1 elements, which will have 2 valence electrons). 1. Draw the dot diagrams for the following atoms and answer the questions below: Nitrogen (N) Selenium (Se) Iodine (I) Neon (Ne) Fluorine (F) Helium (He) Carbon (C) How many unpaired electrons do each of these atoms have? N _____ Se _____ I _____ Ne _____ F _____ He _____ C _____ How many covalent bonds can each of these atoms make? N _____ Se _____ I _____ Ne _____ F _____ He _____ C _____ 2. a) Draw the electron dot diagrams: b) How many unpaired electrons does one nitrogen atom have? ________ c) How many covalent bonds does one nitrogen atom need to make? ____ d) How many unpaired electrons does one hydrogen atom have? _______ e) How many covalent bonds does one hydrogen atom need to make? ___ f) How many hydrogen atoms would bond with one nitrogen atom to form a stable molecule? ________ g) Draw models for the molecule that will form between nitrogen and hydrogen atoms. How many electrons does each of the hydrogen atoms have around them? ___________ How many electrons does the nitrogen atom have around it? ________ Nitrogen Hydrogen Electron Dot Diagram Structural Formula This study source was downloaded by 100000874968972 from CourseHero.com on 04-09-2024 06:56:09 GMT -05:00 https://www.coursehero.com/file/173191892/covalent-bonding-step-by-stepdoc/ 3. a) Draw the electron dot diagram: b) How many unpaired electrons does one iodine atom have? ________ c) How many covalent bonds does one iodine atom need to make? ____ d) How many iodine atoms would combine together to form a stable molecule? ________ e) Draw models for the molecule that will form between iodine atoms. How many electrons does each of the iodine atoms have around them? ________________ 4. a) Draw the electron dot diagrams: b) How many unpaired electrons does one chlorine atom have? _________ c) How many covalent bonds does one chlorine atom need to make? ____ d) How many unpaired electrons does one hydrogen atom have? _______ e) How many covalent bonds does one hydrogen atom need to make? ___ f) How many hydrogen atoms would bond with one chlorine atom to form a stable molecule? ________ g) Draw models for the molecule that will form between chlorine and hydrogen atoms. How many electrons does each of the hydrogen atoms have around them? ___________ How many electrons does the chlorine atom have around it? ________ Iodine Electron Dot Diagram Structural Formula