Monday, June 20, 2011

Trends in Electronegativity

 (i)Down The Group
Down the group atomic size increases and hence electronegativity decreases.
(ii).  Along The Period
Along the period, atomic size decreases and hence electronegativity increases.
IUPAC Nomenclature of Elements with Z > 100
IUPAC in 1997 suggested the rules for naming the elements with Z > 100. The main points of this nomenclature are;
1.  The names are derived directly from atomic numbers using numeral roots for 0 to 9 and adding suffix-ium. The roots for number 0 to 9 are;
Digit 0 1 2 3 4 5 6 7 8 9
Root nil un bi tri quad pent hex sept oct enn
Abbreviation n u b t q p h s o e
2.  The names are shortened if there is repetition of a word e.g. bi ium and tri ium are written as buim & trium etc.
3.  The symbol of element is obtained from first letters of the roots of number which make up atomic number of element. E.g. the name of element with atomic number 102 would be unnilbium. Thus its symbol is Unb (u for un, n for nil and b for bi).
101 Unnilunium Unu 111 Unununium Uuu
102 Unnilbium Unb 112 Ununbium Uub
103 Unniltrium Unt 113 Ununtrium Uut
104 Unnilquadium Unq 114 Ununquadium Uuq
105 Unnilpentuim Unp 115 Ununpentium Uup
106 Unnilhexium Unh 116 Ununhexium Uuh
107 Unnilseptium Uns 117 Ununseptium Uus
108 Unniloctium Uno 118 Ununoctium Uuo
109 Unnilennium Une 119 Ununennium Uue
110 Ununnilium Uun 120 Unbinilium Ubn

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