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15 Elements to Know
| Question | Answer |
|---|---|
| helium | He |
| oxygen | O |
| hydrogen | H |
| phosphorus | P |
| silicon | Si |
| iron | Fe |
| potassium | K |
| magnesium | Mg |
| sulfur | S |
| nitrogen | N |
| sodium | Na |
| aluminum | Al |
| carbon | C |
| argon | Ar |
| calcium | Ca |