Nomenclature Of Elements With Atomic No > 100
Periodic Properties of Class 11
The naming of the new elements had been left earlier traditionally to its discoverer and the suggested name was ratified by the IUPAC, but some of these elements have been assigned two names/ symbols. To overcome all these difficulties, the IUPAC appointed a Commission on Nomenclature of Inorganic Chemistry (CNIC). In 1997 IUPAC approved the names based on the following points.
- The names are derived directly from the atomic numbers using numerical roots for 0 and numbers from 1-9 and adding the suffix ium
- In certain cases, the names are shortened. For example biium & triium are shortened to bium & trium
Roots for IUPAC nomenclature of elements are given below.
The recommended and official names of some super heavy elements are given below
|Z||Recommended name||Symbol||IUPAC official name||IUPAC symbol|
Long Form of the Periodic Table and Electronic Configuration of Elements:
Each period starts with an alkali metal whose outermost electronic configuration is ns1.
Each period ends with a noble gas of outermost electronic configuration ns2np6 except He. The electronic configuration of He is 1s2
The number of elements in a period is equal to the number of necessary electrons to acquire the ns2np6 configuration in the outermost shell of the first element (alkali metal) of the period. First period contains two elements.
The number of elements in each period may be determined by the number of electrons in a stable configuration as under
|Periods||Stable electronic configuration||Number of electrons|