English Nonmetal Cited by user Sandbh on 31 Dec 2023 A nonmetal is a chemical element that mostly lacks metallic properties. Seventeen elements are generally considered nonmetals, though some authors recognize more or…
English Lanthanide Cited by user ComplexRational on 21 May 2023 The lanthanide or lanthanoid series of chemical elements comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium.
Chinese 镧系元素 Cited by user Hacter Chang on 06 Apr 2023 鑭系元素是第57号元素镧到71号元素镥|-{zh-hans:镥;zh-hant:鎦}-(或称-{zh-hans:镏;zh-hant:鑥}-)共15种化學元素的统称. 镧系元素位於元素週期表第6週期的鋇與鉿之間,位於錒系元素上方,但通常為了避免週期表形狀過寬影響觀看,而將鑭系和錒系元素移至週期表下方獨立列出.
English Boron group Cited by user 2402:800:628F:53DE:953D:654A:478F:EE49 on 17 Apr 2022 The boron group are the chemical elements in group 13 of the periodic table, comprising boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl), and perhaps…