A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions.
近义、反义、联想词
近义词
n.
unit, building block, material, stuff
解析
molecule 指物质中保持原物质的一切化学性质,能独立存在的最小微粒,即分子。 atom 指元素的最小粒子,其体积比molecule小。 particle 指任何物质的微粒,引申指任何小的部分。 speck 一般指“微点”或“微粒”,可引申指“斑点、污点”。 grain 通常指能为肉眼清楚看到的颗粒,比上述几个词所表“粒”的体积大。