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via reference-data/1.0Jun 12, 2026ulv2:a47f047beadd…ark:12345/ulbb1d11ff79hsm3.v1.0.0
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actinideActinideRadioactive metals with atomic numbers 89-103, characterized by filling of the 5f electron shell.
alkali-metalAlkali MetalSoft, highly reactive metals in Group 1 that readily lose their outermost electron to form +1 cations.
alkaline-earth-metalAlkaline Earth MetalReactive metals in Group 2 with two valence electrons, forming +2 cations.
halogenHalogenHighly reactive nonmetals in Group 17 that readily form salts with metals.
lanthanideLanthanideRare earth metals with atomic numbers 57-71, characterized by filling of the 4f electron shell.
metalloidMetalloidElements with properties intermediate between metals and nonmetals, often used as semiconductors.
noble-gasNoble GasExtremely stable, mostly unreactive gases in Group 18 with complete valence electron shells.
post-transition-metalPost-Transition MetalMetallic elements located between transition metals and metalloids, generally softer and with lower melting points than transition metals.
reactive-nonmetalReactive NonmetalNonmetallic elements that readily form covalent bonds and gain electrons in chemical reactions.
transition-metalTransition MetalMetals in Groups 3-12 with partially filled d-orbitals, often exhibiting multiple oxidation states and forming colored compounds.