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Whatwouldbe theatomicnumberof the next(i)alkali metal (ii)alkalineearthmetal (ii)halogenand (iv)inertgas Ifdiscoveredin future ? |
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Answer» Solution :(i) Thenextalkali metalifdiscovered willhave tobeplacedin theeighth period and henceitsouterelectronicconfigurationwillbe `8s^(1)` . Thereforeitsatomicnumberwillbe(118 +1)= 119. (ii)Similarly , the nextalkalineearthmetalifdiscovered willhave `8s^(2)` as itsouterelectronicconfigurationand henceitsatomicnumberwill be(118 + 2) =120. (III) thenexthalogenif discoveredwill have`7s^(2) 7p^(5)` as itsouterelectronicconfiguration.Sincethefillingof 7p-orbitals willbeginafterfillingof 6d- orbitals in accordancewithaufbauprinciplewe canaccommodate only 112elements thereforethe atomicnumbero the nexthalogenif discoveredwill be(112 + 5) =117 . (iv) Ina similarwaywe caneasilyexplainthat the nextinertgas , if discoveredwill have`7s^(2) 7p^(6) ` asouter electronicconfigurationand itsatomicnumberwill be(112 +6) =118. |
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