Unit 4 Atoms, Elements, and Compounds

Atom

Smallest particle of an element

Element

A substance that cannot be broken down into simpler substances

Matter

Anything that has mass and takes up space

Chemical symbol

Shortened way of writing the name of an element

Molecule

Smallest part of a substance that has all the properties of that substance

Chemical bond

The force that holds atoms together

Compound

Substance made up of two or more elements that are chemically combined

Mixture

Two or more substances that have been physically combined

Substance

Any element or compound

Chemical Change

Change that produces new substances

Physical change

Change that does not produce new substances

positively charged

an object that has lost electrons and has more protons

negatively charged

matter that has more negative than positive charges

pure substance

A substance made of only one kind of matter and having definite properties.