原子半径 yuánzǐbànjìng atomic radius Origin Definitions Defs Strokes Stroke Words Sentences Sents 原子 yuánzǐ noun atom atom; atomic; the smallest unit of a chemical element, consisting of a nucleus surrounded by electrons半径 半徑 bànjìng noun radius The distance from the center of a circle or sphere to its outer edge; half of a 直径 zhíjìng