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Chapter 9
Lewis Structures
| Question | Answer |
|---|---|
| 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
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