The International Union of Pure and Applied Chemistry (IUPAC) is an international, non-governmental organization whose purpose is to address issues in the chemical sciences. Every element that is newly discovered or synthesized in lab is checked and regulated by IUPAC and then it is named . Names that follow IUPAC rules are known as systematic names, or IUPAC names. IUPAC is also responsible for the nomenclature of elements.
<span>International Union of Pure and Applied Chemistry</span>
Subject to confirmation by the union's members at a meeting in Geneva next August [1997], these will be the names of the six new elements: Element 104, Rutherfordium<span> (symbol Rf); Element 105, </span>Dubnium<span> (symbol Db); Element 106, </span>Seaborgium<span> (symbol Sg); Element 107, </span>Bohrium<span> (symbol Bh); Element 108, </span>Hassium<span> (symbol Hs), bol Mt).</span>
i) The bond angle decreases due to the presence of lone pairs, which causes more repulsion on the bond pairs and as a result, the bond pairs tend to come closer. ii) The repulsion between electron pairs increases with an increase in electronegativity of the central atom and hence the bond angle increases.
