CHEM
WA 09_CHE-121-jan18.docx

WA 09_CHE-121-jan18.docx - Name Robert Velat College ID...

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Name: Robert Velat College ID: 0254046 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Module 9 Semester and year: JUN2018 Written Assignment 9: Chemical Bonding Answer all assigned questions and problems and show all work. 1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number. (8 points) Group 1A 2 nd element is Na (Z=11); 1s 2 2s 2 2p 6 3s 1 Number of valence electrons is 1 (3s 1 ) Group 2A 2 nd element is Mg (Z=12); 1s 2 2s 2 2p 6 3s 2 Number of valence electrons is 2 (3s 2 ) Group 3A 2 nd element is Al (Z=13); 1s 2 2s 2 2p 6 3s 2 3p 1 Number of valence electrons is 3 (3s 2 3p 1 ) Group 4A 2 nd element is Si (Z=14); 1s 2 2s 2 2p 6 3s 2 3p 2 Number of valence electrons is 4 (3s 2 3p 2 ) Group 5A 2 nd element is P (Z=15); 1s 2 2s 2 2p 6 3s 2 3p 3 Number of valence electrons is 5 (3s 2 3p 3 ) Group 6A 2 nd element is S (Z=16); 1s 2 2s 2 2p 6 3s 2 3p 4 Number of valence electrons is 6 (3s 2 3p 4 ) Group 7A 2 nd element is Cl (Z=17); 1s 2 2s 2 2p 6 3s 2 3p 5 Number of valence electrons is 7 (3s 2 3p 5 ) (Reference: Chang 9.2) 2. Explain the following: (3 points) a. ionic bond: Also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom. The atom that loses the electrons becomes a positively charged ion (cation), while the one that gains them becomes a negatively charged ion (anion).
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  • Spring '15
  • Khurana
  • Chemistry, Atom, Chemical bond, Edison State University

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