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Chapter 9

Lewis Structures

What are the 3 types of bonds? Ionic, covalent and metallic
An ionic bond ___ electrons and are composed of: transfers, a metal and nonmetal
A covalent bond is composed of two nonmetals
Octet rule is used with ___ bonding covalent
An atom has an octet when it has: 8 valence electrons - particularly stable
___ and ___ always has two paired dots for Lewis structures H and He
Bonding pair A pair of shared electrons
Lone pair Electrons not involved in bonding
Most electronegative atom? Fluorine
Dipole moment occurs: anytime there is a separation of positive and negative charge
Resonance structure 1 or 2 more skeletal structures that has the same skeletal structure formula
Formal charge A charge assigned to each atom to determine the best way to draw a lewis structure
Free radicals are also known as ____ odd-electron molecules
Odd electron molecules molecules and ions with an odd number of electrons in their Lewis structure. ex: NO
Incomplete octets molecules of ions w/ fewer than 8 electrons around an atom
Incomplete octets and ___ are the same thing electron deficient molecules
Expanded octets molecules that may have more than 8 electrons around an atom
3 exceptions to the octet rule? 1. odd elctrpn molecules 2. incomplete octets 3. expanded octets
Because of the d-orbital, atoms in the ___ period or later can accomodate more than 8 electrons 3rd
When bonds break, the process is ___ endothermic
When bonds form, the process is ___ exothermic
When we have different nonmetals comnined, this is a __ molecular compound
When we have the same nonmetals combined, this is a __ molecular element
Atomic element exists when we have an element by itself
Covalent bonding results from ___ sharing of electrons
Metals typically have a ___ electronegativity LOWER
Electronegativity has the same trend as ionization energy
Dipole arrows are used to: show the difference in electronegativity between 2 elements bonded together
The dipole arrow points towards: more electronegative element
Dipole arrows must be used if a polar bond exists
Nonpolar bond when electronegatives are the same
Polar bond the difference in electronegatives
Resonance structures are used when __ __ are involved multiple bonds
Bond order average strength of the bond
Bond energy the amount of energy required to break mole of bonds
Created by: Mariahj25