The Periodic Table
Terms and Definitions
Atom
-
The smallest unit of matter that can exist of an element.
Compound
-
A molecule containing two or more different atoms bound together.
Element
-
A fundamental substance that has a unique atomic
number on the
periodic table.
Gas
-
A form of matter that has mass but no definite shape, and can be either compressed or expanded to fill an infinite volume.
Isotope
-
A different form of an element that varies by the number of
neutrons in the
nucleus.
Liquid
-
A form of matter which has mass, occupies a volume, and flows to adopt the shape of its container.
Solid
-
A form of matter which has a definite shape and volume.
