The element 119 has not been discovered . What could be the IUPAC name and symbol for This element ? On the basis of the periodic table , predict the electronic configuration of this element and also the formula of its most stable chloride and oxide.

Explanation

(i) The roots for 1 and 9 are un and en respectively . Therefore the name for the element with Z= 119 un + un + enn + ium = ununennium and its symbol is Uue.
(ii) the maximum number to elements which can be accormmodated in the present set up of the long form of the periodic table = 118 (For details refer to Q.2 , page `3//61`) .Since this last element would be an inert gas, therefore the element with Z= 119 will be an alkali metal and hence its outer electronic configuration will be `8s^(1)` or its complete electronic confitguration will be
` 1s^(2) 2s^(2) 2p^(6) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 4f^(14) 5s^(2) 5p^(6) 5d^(10) 5f^(14) 6s^(2) 6d^(10) 7s^(2) 7p^(6) 8s^(1) ` or `[Og] 8s^(1)`
(iii) Since the element with Z = 119 wil be an alkali metal , therfore formula of its chlorine will be MCI and that of its stable oxide will be bold `M_(2)O` where M is the alkali metal.