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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 |