Numeration

Numeration

You can change the numeration to IUPAC and CAS or switch it off.

IUPAC

The IUPAC is the International Union of Pure and Applied Chemistry. This is an organization which defines the most standards for chemical concerns.

An “A” means that that period is a maingroup, a “B” means it is a Nebengruppe.

CAS

The CAS is the Chemical Abstracts Service. With their numeration the 18 groups have the numbers from 1 to 18. Though the IUPAC numeration is the official, the CAS numeration is what is effectivly used.

Off

If this option is active of course no period-numeration will be in effect.

KDE Logo