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Chemistry
Review key vocabulary
14
Science
8th Grade
11/15/2011

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Term
Proton
Definition
Particle of matter that makes up an atom. Found in the nucleus it has a positive charge.
Term
Electron
Definition
Particle of matter that makes up an atom. Found outside the nucleus. It has a negative charge.
Term
Neutron
Definition
Particle of matter that makes up an atom. Found inside the nucleus. It has no charge.
Term
Periodic Table
Definition
A table that organizes the different elements that make up all matter.
Term
Nucleus
Definition
The center of an atom. Both protons and neutrons are found inside the nucleus.
Term
Valance Electrons
Definition
The electrons that are found in the last shell of an atom. Farthest away from the nucleus.
Term
Element
Definition
A pure substance that makes up matter. There are over 100 different elements.
Term
Reactants
Definition
The elements on the left side of a chemical equation.
Term
Products
Definition
The elements on the right side of a chemical equation.
Term
Compound
Definition
Two are more elements that are chemically combined.
Term
Groups
Definition
There are 18 groups on the periodic table. They run up and down in a column.
Term
Periods (Rows)
Definition
There are 7 periods on the Periodic Table. The run horizontally on the table.
Term
Chemical Equation
Definition
A short way of writing a chemical reaction using symbols and numbers.
Term
Coefficient
Definition
The large number in front of an element telling you how many molecules you have of this element. ex. 3Si
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