The chemistry of each element is determined by its number of protons and electrons. In a neutral atom, the number of electrons equals the number of protons. ... <看更多>

The mass number of Carbon-14 is A=14, while its atomic mass is given by m(14C)=A⋅1u+mass defect=14u+mass defect. Here 1u≈1.66054⋅10−27kg ... ... <看更多>