Answer:
The last period, i.e. 7th period of
the extended form of periodic table will have the element with atomic number 118
(Noble gas). Thus, the element 117 will belong to halogen group and seventh
period. Its electronic configuration is:
\[[Rn]5{{f}^{14}}6{{d}^{10}}7{{s}^{2}}7{{p}^{5}}\]
7th
period, 17th group
The element with atomic number 120, will be placed in group
2 (alkaline earth metals) and will have the configuration \[[Uuo]8{{s}^{2}}.\]
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