| A | B |
|---|
| matter | is in everything and has mass and takes up space |
| element | a substance that cannot be made into a simpler substance |
| atom | smallest unit of an element with the properties of the element |
| alchemist | first chemists |
| proton | the particle in the nucleus with a positive charge |
| neutron | particle in the nucleus with no charge |
| electron | smallest particle that has a negative charge |
| electron cloud | space around the nucleus that contains the electrons |
| nucleus | center of the atom, contains most of the atom's mass |
| atomic number | tells how many protons are in an atom |
| atomic weight | tells the mass of the atom |
| periodic table | table with all the elements arranged by properties |
| symbol | the abbreviation for an element |
| oxygen | earth's most common element |
| silicon | second most common element |
| calcium | found in bone and teeth as well as milk and cheese |
| sodium | element found in salt |
| hydrogen | element found in water and in the air |
| iron | metal found in foods such as spinach |
| aluminum | metal used to make cans and pans |
