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Chapter 4 - Chemistry
Vocab Words For Test 2.13.12
19
Science
8th Grade
02/10/2012

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Term
Valence Electron
Definition
an electron in the outer shell of an atom which can combine with other atoms to form molecules.
Term
Chemical Bond
Definition
The force of attraction between two or more bonded atoms
Term
Electron Dot Diagram
Definition
a diagram that uses dots to represent an element's valence electrons.(Lewis Dot Structures)
Term
Ion
Definition
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
Term
Polyatomic Ion
Definition
An ionic species containing more than one element.
Term
Ionic Bond
Definition
a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion
Term
Ionic Compound
Definition
a chemical compound in which ions are held together in a lattice structure by ionic bonds
Term
Chemical Formula
Definition
a representation of a substance using symbols for its constituent elements
Term
Subscript
Definition
Little number to the right of an elements chemical symbol
Term
Crystal (Structure)
Definition
a structure in which the atoms, molecules, or ions are packed in a regularly ordered, repeating pattern
Term
Covalent Bond
Definition
a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms
Term
Molecular Compound
Definition
A substance formed when two or more molecules combine
Term
Molecule
Definition
A group of atoms bonded together
Term
Double Bond
Definition
A chemical bond in which two pairs of electrons are shared between two atoms
Term
Triple Bond
Definition
A chemical bond in which two atoms share three pairs of electrons
Term
Polar Bond
Definition
A chemical bond in which electrons are not shared equally, yet the atoms still become stable.
Term
Non-polar Bond
Definition
A chemical bond in which electrons are equally shared
Term
Metallic Bond
Definition
A bond between two metals
Term
Alloy
Definition
A combination of metals (like gold and a harder element)
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