| A | B |
|---|
| Atom | smallest particle of an element |
| Properties of an atom | determine how that element can combine with other elements |
| Nucleus | Center of an atom |
| Protons | + charge |
| Atomic number = | #of protons |
| Neutons | No charge - neutral |
| Electrons | - (negative) charge |
| #of protons = | # of electrons |
| # of neutrons = | atomic mass - # of protons |
| Column in the periodic table of elements | elements have similar chemical properties |
| Rows in the periodic table of elements | arranged by # of protons |
| Molecule | smallest part of a substance made of more than 1 atom |
| Atoms in a molecule | the atoms are bonded together |
| Compound | Mattermade of a combination of elements |
| Properties of a compound | Differ from the properties of the lements that make them up |
| Compound formula | recipe like H20 or CO2 |
| Salts | 1 metal element and 1 nonmental element |
| Crystals | particles arrange themselves in a regular geometric pattern |
| Matter | Solids, liquids, and gases |
| Solids | Have a definite shape and volume |
| Liquids | Take on the shape of their container - do have VOLUME |
| Gases | particles are very far apart - do not have definite shape OR volume |
| Freezing point = | Melting point |
| Freezing and Melting points | are different for different materials |
| Materials change size | when they change temperature |
| The hotter a material gets | the faster its particles move - more space between them |
| The colder a material gets | the closer the particles become - they move more slowly |
| Particles NEVER stop | vibrating |
| Boiling point | temperature at which a liquid turns into a gas |
| Condesation | Gas turns into a liquid |
