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Elements
25 elements that must be memorized
| Term | Definition |
|---|---|
| hydrogen | H |
| helium | He |
| lithium | Li |
| carbon | C |
| nitrogen | N |
| oxygen | O |
| fluorine | F |
| neon | Ne |
| sodium | Na |
| magnesium | Mg |
| aluminum | Al |
| phosphorus | P |
| sulfur | S |
| chlorine | Cl |
| potassium | K |
| calcium | Ca |
| iron | Fe |
| nickel | Ni |
| copper | Cu |
| silver | Ag |
| iodine | I |
| gold | Au |
| mercury | Hg |
| lead | Pb |
| radon | Rn |