Afhængig af tilgængelige data i & kalzium; ser du forskellige radier for grundstoffet. Den kovalente radius er radien af et uladet atom af grundstoffet i et molekyle. Det ville for eksempel kunne være O- H afstanden i vand. Atomradien er radius for et elementært atom, & eg; ikke bundet til noget. Van der Waalradien er defineret som afstanden mellem to atomer af samme slags i to ligeværdige molekyler, for eksempel to kulatomer i propan. Den sidste mulige radius er ionradien inklusive dens ladning.
Depending on the data available in & kalzium; you will see different radii of the element. The covalent radius is the radius of a non charged atom of the element in a molecule. The could for example be the O-H-distance in Water. The atomic radius is the radius of an elemental atom, & eg; not bound to anything. The van der Waals-radius is defined as the distance of two atoms of the same sort in two equal molecules, for example two carbon-atoms in propane. The last possible radius is the ionic radius including its charge.