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Element 117 is lie in 17 th group and in halogens family in periodic table it is ununseptium is a artificial chemical element with temporary symbol Uus and atomic number 117. 120 is not exists yet. 
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117th element lies in 17th group and halogen family.It's name is Ununseptium. It's temporary symbol is Uus . It is also known as aka-astatine. It is the second lightest element. It was discovered in the year 2010 in Dubna,Russia.
120th element does not exist.

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