| A | B |
|---|
| The lanthanides are _________ they are hard to separate | so similar |
| Three lanthanides are named for cities in Sweden | erbium (Er), ytterium (Yb), and terbium (Tb) |
| Flints used in lighters are made of this lanthanide metal | cerium |
| This period of elements is used in welders masks, TV screens, computer monitors, lasers, and movie projectors | lanthanides |
| all the _______ are radioactive | actinides |
| These are the only actinides that are found naturally on Earth | Thorium, Protactinium, Uranium |
| ______is found in the Earth's crust because its half life is long | Uranium |
| This actinide is used as fuel in nuclear power plants | plutonium |
