| Answer | Crossword Clue |
|---|---|
| HYDROGEN | Most abundant element |
| OXYGEN | Most abundant element in the earth's crust |
| NEON | Fifth-most abundant element in the universe |
| SODIUM | Sixth most abundant element in the Earth's crust |
| IRON | Abundant element |
| SILICON | Abundant element. |
| IRON | Element abundant in liver |
