| The Alkaline Earth Metals | | Across | | | 2. | | Two of this element's compounds burn with a red flame and are used in fireworks and signal flares. | | | 4. | | A fair amount of this element can be found in your bones. | | | 5. | | One of this element's compounds is used to produce X-ray images of the intestinal tract. | | | 6. | | This element burns with a brilliant white light. | |
| | Down | | | 1. | | The first member of this group, this element can be used as a neutron source. | | | 3. | | All isotopes of this element are radioactive. | |
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