What would you predict to be the atomic number of the noble gas of the seventh period (as yet unknown)?

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Question

What would you predict to be the atomic number of the noble gas of the seventh period (as yet unknown)?

David · Accepted Answer

Solution:TTs141112_51130_22
To start with the first Noble gas, He, it has two electrons and has electronic 
configuration 1s2.
Next period starts with n =2 shell. It can accommodate maximum 2n2 = 2 x (2)2 = 8 
electrons. The noble gas of this period Ne has electronic configuration [He]2s22p6.
Eight electrons are added to the third period (n= 3) also, though it has 3d orbitals, 
filling up of these orbitals are not energetically favorable.

What would you predict to be the atomic number of the noble gas of the seventh period (as yet unknown)?

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