Element
A pure substance that can not be separated by physical or chemical means.
Compound
Matter that is composed of two or more different elements that are chemically combined
Pure Substance
Matter that is made of the same particles throughout.
Chemical Symbol
The alphabet symbol that represents each element on the periodic table.
Periodic Table of Elements
A chart of the elements organized by atomic number and arranged to show the repeating pattern of their properties.
Matter
Anything that has volume and mass
Atomic Number
The number of protons (positive charges) in an
atomic nucleus
Groups
The columns on a periodic table that arrange the
elements by select characteristics
Periods
The rows in a periodic table that classify the
elements by select characteristics
Atom
The smallest unit of an element that has all of the
properties of that element
Physical Property
Those characteristics that can be observed without
changing the identity of the substance such as
size, shape, luster, conductivity, malleability, and
magnetic attraction
Chemical Reaction
The process by which one or more substances
change to produce one or more different
substances
Chemical Formula
A shorthand notation that uses chemical symbols
and numbers as subscripts to represent the type of
atoms and number of atoms that are present in the
smallest unit of the substance
Atomic mass
Total number of protons and neutrons