| 释义 |
carbon-12
car·bon-12 C5102800 (kär′bən-twĕlv′)n. A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon-12 makes up most naturally occurring carbon.carbon-12
carbon-12[′kär·bən ′twelv] (nuclear physics) A stable isotope of carbon with mass number of 12, forming about 98.9% of natural carbon; used as the basis of the newer scale of atomic masses, having an atomic mass of exactly 12u (relative nuclidic mass unit) by definition. |