Its a very complex entity which consists, according to a simplified Bohr model, of a central nucleus orbited by electrons, somewhat similar to planets orbiting the sun - see Figure 1.1.
Det er en komplisert enhet som, ifølge en forenklet Bohr-modell, er en sentral nukleus av elektroner, litt lignende for planetene i banen rundt solen – se figur 1.1.