Chemical element

species of atoms having the same number of protons in the atomic nucleus and the same chemical properties, but not nessarily the same mass, or the same stability (or half-lifetime if they are unstable)

gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium americium curium berkelium californium einsteinium dietary mineral fermium mendelevium nobelium rare earth element lawrencium actinide metalloid nonmetal halogens noble gases trace element CHON radioactive element Mendeleev's predicted elements hydrogen helium lithium polyatomic non-metals beryllium boron carbon nitrogen oxygen fluorine neon sodium magnesium aluminium silicon francium phosphorus iron sulfur chlorine argon potassium

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