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Science Vocabulary #12 - Modified

Is a negatively charged subatomic particle.
The shorthand scientists use to describe a chemical reaction.
A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
A material made up of two or more different substances which are mixed but are not combined chemically.
Defined as substances that are made of only one type of atom or only one type of molecule.
It tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.