What is matter / Counting Atoms

How many elements are there?

118

Compound

A substance made of atoms of two or more elements bound together in definite proportions-substances made by bonding atoms together in specific ways -When atoms of elements combine to form compounds, they always combine the same way

Element

A substance that cannot be broken down into simpler substances by chemical means.- is a pure substance made of only one kind of atom- Abbreviated by 1 or 2 letter symbol to designate it: First letter is capitalized

examples of elements

Carbon, Oxygen, Gold, Iron, Mercury, Nitrogen, Phosphorus

Atom

Fundamental unit of which elements are made- The smallest unit of an element that maintains the properties of that element

Chemistry

The scientific study of the composition, structure and properties of matter and the changes it undergoes

Matter

anything that has mass and volume- made of atoms

Molecule

the smallest unit of a substance that keeps all of the physical and chemical properties of that substance (smallest unit of a substance that behaves like the substance)- collection of atoms bonded together that behave as unit