| Rating | Solver | Clue |
|---|---|---|
| SILICON | Abundant element | |
| OXYGEN | Abundant element | |
| ALUMINIUM | Most abundant metal element in the Earth's crust | |
| ZINC | An abundant element of the magnesium-cadmium group, extracted principally from the minerals zinc blende, smithsonite, calamine, and franklinite... | |
| HYDROGEN | ... thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those of animal o... | |