Lewis Dot Structures Lewis Dot Structures for Single

Lewis Dot Structures

Lewis Dot Structures for Single Elements Ar S Br Li

Mg C B N O K

Molecules H 2 O

Electronegativity: Important for central atom

CO 2

PF 5 BH 3

CN 1 -

C 2 H 6 C 2 H 3 O 21 -

CCl 4 ICl 3

Be. Cl 2 COH 2

CCl. FBr 2 SH 2

What is VESPR

VSEPR • valence-shell electron-pair repulsion (abbreviated VSEPR and pronounced “VESper”) theory • basic principle is valence electrons around a central atom stay as far apart as possible to minimize the repulsions

Draw the Lewis structure for Br. F 3

Polarity • Polarity is the uneven partial charge distribution between various atoms in a compound. • Atoms, such as nitrogen, oxygen, and halogens, that are more electronegative have a tendency to have partial negative charges. Atoms, such as carbon and hydrogen, have a tendency to be more neutral or have partial positive charges. • Electrons in a polar covalent bond are unequally shared between the two bonded atoms, which results in partial positive and negative charges.

Polarity • Polarity occurs based on the difference in electronegativity between atoms in a molecule having an unequal distribution • Electronegativity is an expression of an atom's tendency to attract electrons in a chemical bond • In order to determine the polarity of a bond, you must find the difference in the electronegativity of the atoms involved • If the difference is between 0. 4 and 1. 7, the bond will be polar

Polarity Polar

Polar or Non-Polar?

Polar or Non-Polar?

Polar or Non-Polar?

Polar or Non-Polar?