Lecture04222

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Information about Lecture04222

Published on July 22, 2008

Author: uladzimir

Source: slideshare.net

Description

a supplemental resource for students

Chemical Bonding: Electronegativity and Polarity Lecture 4

Complete electron transfer does not exist. No does complete electron sharing.

Albert Einstein (1879-1955), German-born scientist

Albert Einstein (1879-1955), German-born scientist

The great majority of compounds have bonds that are most accurately thought of as partially ionic and partially covalent. There is a continuum.

What is electronegativity?

Linus Carl Pauling (1901-1994), Oregonian scientist

Linus Carl Pauling (1901-1994), Oregonian scientist

 

Trends in electronegativity: Electronegativity generally increases up a group and across a period. Nonmetals are more electronegative than metals.

Electronegativity generally increases up a group and across a period.

Nonmetals are more electronegative than metals.

Trends in electronegativity

How to use electronegativity for determining oxidation number: The more electronegative atom in a bond is assigned all the shared electrons; the less electronegative atom is assigned none. Each atom in a bond is assigned all of its unshared electrons. The oxidation number = number of valence electrons – (number of shared electrons – number of unshared electrons).

The more electronegative atom in a bond is assigned all the shared electrons; the less electronegative atom is assigned none.

Each atom in a bond is assigned all of its unshared electrons.

The oxidation number = number of valence electrons – (number of shared electrons – number of unshared electrons).

A polar molecule δ + δ -

A sample problem on determining bond polarity from electronegativity values.

A greater difference in electronegativity results in larger partial charges and a higher partial ionic character.

THE END

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