| A | B |
|---|
| alkali metals | highly reactive; soft, easily cut; 1 valence electron; NOT found in elemental form on earth |
| alkaline earth metals | hard; very reactive; 2 valence electrons |
| metalloids | have properties of both metals and non-metals; semi-conductors; on stair step of Ptable |
| argon | used in incandescent bulbs; glows blue in signs; noble gas; non-metal |
| halogens | salt producers; non-metals; 7 valence electrons; commonly bond with alkali metals |
| noble gases | don't bond with other elements; full outer shells, commonly used in lighting |
| hydrogen | odorless, colorless, tasteless, lightest, most abundant, simplest (#1) element; flammable; non-metal |
| sodium, potassium, calcium, magnesium | important to people's diets; used in vitamins & medication; metals |
| lithium | used in batteries and medication; alkali metal |
| uranium | used as nuclear fuel; most massive natural element; metal |
| aluminum | lightweight, used to make cans and parts for transportation; can be recycled FOREVER parts; metal |
| silicon & germanium | used as semiconductors; useful in electronic industry; metalloids |
| carbon | found in all living things; forms proteins, fats, & carbohydrates; non-metal |
| nitrogen | 80% of the air we breathe; used to make fertilizers; non-metal |
| oxygen | animals breathe it; protects earth from UV rays; non-metal |
| fluorine | nonstick cookware; prevents tooth decay; halogen; non-metal |
| chlorine | kills bacteria, disinfects; a part of salt (NaCl); halogen; non-metal |
| helium | glows yellow; used in balloons and blimps; noble gas; non-metal |
| neon | glows red; used in lighted signs; noble gas; non-metal |
| hydrogen | 90% of atoms in the universe; make up stars |
| silicon | most widely used metalloid; used in computer industry |
| magnesium | most wide used alkaline earth metal; used in fireworks; used in vitamins & medicine |
