An element's atomic number defines it ... nucleus there are no electrons There are 92 protons and 146 neutrons. \(_{1}^{3}\textrm{H}\) Number of protons Z = 1 Number of protons + neutrons A ...

The typical size of atoms and small molecules is around 1 × 10-10 m (0.1 nm). For example: diameter of a hydrogen atom, H 1.0 × 10-10 m width of a hydrogen molecule, H 2 2.9 × 10-10 m ...