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Unit 5: Section 1: "Bonding"
Flash Cards for the Unit 5 Vocabulary
16
Science
8th Grade
12/01/2010

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Cards

Term
Valence Electrons
Definition
The electrons that are in the highest energy level of an atom that are involved in the chemical reactions
Term
Electron dot diagram
Definition

A representation of the valence e's in an atom, using dots

 

EX:  Mg:

Term
Chemical bond
Definition
The force that holds atoms together
Term
Ion
Definition
An atom or group of atoms that has become electrically charged
Term
Polyatomic ion
Definition
An ion that is made of more than one atom
Term
Ionic bond
Definition
The attraction between oppositely charged ions
Term
Chemical formula
Definition
A combination of symbols that represents the elements in a compound and their properties
Term
Subscript
Definition
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Term
Oxidation number
Definition
the number of electrons an atom gains, loses, or shares when it forms a chemical bond
Term
Covalent bond
Definition
A chemical bond formed when two atoms share electrons
Term
Molecular compound
Definition
a compound that is composed of molecules
Term
Diatomic molecule
Definition

a molecule consisting of two atoms.

 

Ex: 02     H2

Term
Polar Bond
Definition
a covalent bond in which electrons are shared unequally
Term
Nonpolar bond
Definition
A covalent bond in which electrons are shared equally
Term
Metallic bond
Definition
An attraction between a positive metal ion and the electrons surrounding it
Term
Alloy
Definition
A mixture of two or more elements, one of which is a metal
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