Spartan 110 (Chapter 4)

What is Lewis structure?

• A structure where atoms combine by gaining, losing or sharing electrons to achieve stability as the nobel gas configuration.

• Distribution of electron pair about the central atom.

• A structure which tells how we arrange/ where to put the valence electron in the molecule

• A structure which tells how we arrange/ where to put the electron in the molecule

Lewis symbol consists of:

• Symbol of acceptor atom

• The symbol of an element

• Charge of each element

• Dots or cross to represent valence electron in an atom of the element

Types of stabilities of cations and anions electronic configuration:

• Half-filled electronic configuration

• Bohr's electronic configuration

• Noble gas configuration

• Pseudo-noble gas configuration

Type of bonds:

• Dative bond

• Ionic bond

• Incomplete bond

• Covalent bond

Conditions where exception to the octet rule occur:

• Even number electrons

• Odd number electrons

• Expanded octet

• Incomplete octet

Order of electron pair-electron pair repulsions:

• LP-LP > BP-BP > LP-BP

• BP-BP> LP-BP> LP-LP

• LP-LP > LP-BP > BP-BP

• LP-BP> LP-LP >BP-BP

2 categories of molecules:

1. 1) Central atom has _________ and____________________.

Molecular polarity depends on:

• Electronegativity of the bonded atom

• Total number of valence electron

• Molecule shape

• Electronic configuration of molecule

Same atoms:

• Non-polar bonds

• Similar electronegativity

• Polar bonds

• Electron density shared equally between the two atoms

Dipole moment=

• Q/r

• Qr

• Q+r

• Qr²