| 释义 |
atomic numberaˌtomic ˈnumber / / noun [countable] (physics物理, chemistry化学) the number of protons (= pieces of matter with a positive electrical charge) that a chemical element has in its center (the nucleus)原子序数 HELP Elements are arranged in the periodic table according to their atomic numbers.在元素周期表中，元素按原子序数的大小排列。 |