The rows in a periodic Table that classify the elements by the number of electron shells

The smallest unit of an element that has all of the properties of that element.

The process by which one or more substances change to produce one or more different substances

the amount of matter an object contains, measured in grams

Matter that is composed of two or more element hat are chemically combined

A pure subsance that cannot be separated ino simple substances by physical or chemical means.

On the outside of an atom has a negative charge

A 1 or 2 letter notation used to represent an atom of a particular element

a specific type of mixture where on substance is dissolved into another.

when a solute breaks up from a larger crystal of molecules into much smaller group or individual molecules.

a way of listing the elements

the branch of science that studies the properties of matter and how much matter interacts with energy

Inside the nucleus of an atom and has no charge

Inside the nucleus of an atom and has a positive charge