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ATOM
No, atomic mass and atomic diameter are not the same thing. Atomic mass refers to the mass of an atom, which is the sum of the protons and neutrons in the nucleus, while atomic diameter refers to the size of the atom, often measured as the distance between the nuclei of two bonded atoms.
The diameter of a Helium-4 nucleus is approximately 1.7 femtometers, which is equivalent to 1.7 x 10^-15 meters. It is one of the smallest and most dense atomic nuclei.
Fluorine has the smallest atomic radius, while Francium has the largest atomic radius.
The noble gas with the smallest atomic number is helium, with an atomic number of 2.