| English | Chinese |
| airborne toxic element and organic substances study | 空中毒性物质和有机物研究 |
| chemical element elements and their compounds ; A substance made up of atoms with the same atomic number; common examples are hydrogen, gold, and iron | 化学元素 (只有一种原子组成的物质。常见的例子是氢、金和铁。) |
| element of group Any of the divalent electropositive metals beryllium, magnesium, calcium, strontium, barium, and radium, belonging to group 2A of the periodic table; alkaline earth metals | 第二族元素 (任何带正二价电荷的金属，如：铍、镁、钙、锶、钡、镭属于周期表的第2A族。) |
| element of group Group IV consists of two subgroups: group IVb, main group, and group IVa. Group IVa consists of titanium, zirconium, and hafnium which are generally classified as transition metals. The main group consists of carbonium, silicium, germanium, tin, and lead. The main valency of the elements is IV, and the members of the group show a variation from nonmetallic to metallic behaviour in moving down the group. The reactivity of the elements increases down the group from carbon to lead. All react with oxygen on heating | 第四族元素 (第四族元素，包含两个子族：主族4b及4a族。4a族包含通常被归为过渡金属元素的钛、锆和铪。4b族包含碳、硅、锗、锡、和铅。主要的价数是4价。此族排列从上方的非金属元素至下方的金属元素。元素的反应性由碳至铅递增，且所有元素皆可与氧在加热状况下反应。) |
| element of group Any of the elements of the halogen family, consisting of fluorine, chlorine, bromine, iodine, and astatine | 第七族元素 (卤族元素，包含氟、氯、溴、碘、砹。) |
| element of group Group VI consists of two subgroups: group VIb, the main group, and group VIa. Group VIa consists of chromium, molybdenum, and tungsten. The main group consists of oxygen, sulphur, selenium, tellurium, and polonium | 第六族元素 (第六族元素包含两个子族：主族6b及6a族。6a族包含铬、钼、和钨。主族6b族包含氧、硫、硒、碲、和钋。) |
| element of group Group V consists of two subgroups: group Vb, the main group, and group Va. Group Va consists of vanadium, niobium, and tantalum, which are generally considered with the transition elements. The main group consists of nitrogen, phosphorus, arsenic, antimony, and bismuth | 第五族元素 (第五族元素，包含两个子族：主族56及5a族。5a族包含钒、铌和钽，通常被归为过渡金属元素。主族5b包含氮、磷、砷、锑和铋。) |
| element of group Group III consists of two subgroups: group IIIb and group IIIa. Group IIIa consists of scandium, yttrium, and lanthanium, which is generally considered with the lanthanoids, and actinium, which is classified with the actinoids. Group IIIb, the main group, comprises boron, aluminium, gallium, indium, and thallium | 第三族元素 (第三族元素，包含两个子族：3b和3a族。3a族包含通常被归为镧系的钪、钇、镧和是属于辐射性元素的锕。3b族包含硼、铝、镓、铟、铊。) |
| element of group 0 A group of monatomic gaseous elements forming group 18 (formerly group 0) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) | 零族元素 (构成周期表第18族(早期被称为0族)的单原子气体，包含：氦、氖、氩、氪、氙、氡。) |
| element of group Any of the monovalent metals lithium, sodium, potassium, rubidium, caesium, and francium, belonging to group 1A of the periodic table. They are all very reactive and electropositive; alkaline | 第一族元素 (任何单价金属，如：锂、钠、钾、铷、铯，属于周期表的1A族，反应性高，带正电。) |
| nuclear fuel element A piece of nuclear fuel which has been formed and coated, and is ready to be placed in a reactor fuel assembly | 核燃料成分 (已形成或涂层的核燃料块，并准备将放置在反应堆燃料组件中。) |
| trace element | 微〔痕〕量元素 |
| trace element Any of various chemical elements that occur in very small amounts in organisms and are essential for many physiological and biochemical processes | 微量元素 (任何在生物体中出现的数量很少的、但对于很多生理和生化过程必不可少的不同的化学元素。) |
| trace element | 痕 〔微〕量元素 |
| tracer element | 显迹原子 |
| tracer element | 同位素指示剂 |
| tracer element | 示踪〔痕量〕元素 |
| tracer element | 示踪〔显迹〕原子 |
| transition element One of a group of metallic elements in which the members have the filling of the outermost shell to 8 electrons interrupted to bring the penultimate shell from 8 to 18 or 32 electrons; includes elements 21 through 29 (scandium through copper), 39 through 47 (yttrium through silver), 57 through 79 (lanthanum through gold), and all known elements from 89 (actinium) on | 过渡元素 (一类金属元素，这些元素最外层的8个电子未填满，导致倒数第二层有8到18或32个电子。这此元素包括21至29号元素(钪至铜)，39至47号元素(钇至银)，57至79号元素(镧至金)，以及89号以后的所有已知的元素。) |
