08_lecture-mod-akins042611 - Chemistry 10301 Spring 2011...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 8 Chemical Bonding I: Basic Concepts Chapter Chemistry 10301, Spring 2011 Instructor: Dr. Daniel L. Akins
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chemical Bonding I: Basic Concepts 8 8.1 Lewis Dot Symbols 8.2 Ionic Bonding Lattice Energy The Born-Haber Cycle 8.3 Covalent Bonding Lewis Structures Multiple Bonds Comparison of Ionic and Covalent Compounds 8.4 Electronegativity and Polarity Electronegativity Dipole Moment and Partial Charges 8.5 Drawing Lewis Structures 8.6 Lewis Structures and Formal Charge 8.7 Resonance 8.8 Exceptions to the Octet Rule Incomplete Octets Odd Numbers of Electrons Expanded Octets 8.9 Bond Enthalpy
Image of page 2
Lewis Dot Symbols Atoms combine in order to achieve a more stable electron configuration. Maximum stability results when a chemical species is isoelectronic with a noble gas. Na: 1 s 2 2 s 2 2 p 6 3 s 1 Na + : 1 s 2 2 s 2 2 p 6 10 electrons total, isoelectronic with Ne Cl: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 Cl : 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 18 electrons total, isoelectronic with Ar 8.1
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lewis Dot Symbols When atoms form compounds, it is their valence electrons that actually interact. A Lewis dot symbol consists of the element’s symbol surround by dots. Each dot represents a valence electron. Boron 1 s 2 2 s 2 2 p 1 3 valence electrons B Lewis dot symbol for boron B B B other reasonable Lewis dot symbols for boron
Image of page 4
Lewis Dot Symbols Lewis dot symbols of the main group elements.
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lewis Dot Symbols Dots are not paired until absolutely necessary. Na O •• •• For main group metals such as Na, the number of dots is the number of electrons that are lost. For nonmetals in the second period, the number of unpaired dots is the number of bonds the atom can form. B 1 s 2 2 s 2 2 p 1 C 1 s 2 2 s 2 2 p 2 N •• 1 s 2 2 s 2 2 p 3 5 valence electrons; first pair formed in the Lewis dot symbol
Image of page 6
Lewis Dot Symbols Ions may also be represented by Lewis dot symbols. Na• Na 1 s 2 2 s 2 2 p 6 3 s 1 Na + 1 s 2 2 s 2 2 p 6 Na + O •• •• O 1 s 2 2 s 2 2 p 4 O 2 1 s 2 2 s 2 2 p 6 O •• •• 2 Core electrons not represented in the Lewis dot symbol Valence electron lost in the formation of the Na + ion. Remember the charge
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Ionic Bonding Ionic bonding refers to the electrostatic attraction that holds oppositely charge ions together in an ionic compound. K • K + + e + •• •• I •• •• I e K • K + + + •• •• I •• •• I The attraction between the cation and anion draws them together to form KI 8.2
Image of page 8
Ionic Bonding Lattice energy is the amount of energy required to convert a mole of ionic solid to its constituent ions in the gas phase.
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern