| A | B |
|---|
| element | substance that cannot be broken down into simpler substances |
| electron | negatively charged particle that exsists in the cloud around nucleus of atom |
| proton | positively charged particle in the nucleus of an atom |
| neutron | neutral particle has the same mass as proton found in atoms nucleus |
| electron cloud | region surrounding the nucleus of atom electrons found here |
| atomic number | # of protons in the nucleus of atom |
| isotope | 2 or more atoms of the same element that have diff. # of neutrons in the nuclei |
| mass number | sum of the # of protons and neutrons in the nucleus of an atom |
| atomic mass | average mass of an element |
| metals | generally has shiny luster; good conductor of electricity |
| nonmetals | element that is usually gas poor conductor of heat and electricity |
| metalloids | element that shares some properties with both metals and nonmetals |
| substance | matter with the same composition and properties throughout |
| compound | smallest unit is made up of atoms of more than one element bonded together (water) |
| mixture | when 2 or more substances come together but dont combine to make new substance (sand/water) |
