Input (grade 7): The diameter of the nucleus is in the range of 1.6 fm () (for a proton in light hydrogen) to about 15 fm (for the heaviest atoms, such as uranium).
Output (grade 7): The size (diameter) of the nucleus is in the range of 1.6 fm (10-15 m) (for a proton in light hydrogen) to about 15 fm (for the heaviest atoms, such as uranium).