Answers

2015-03-19T10:54:08+05:30
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. 
0
2015-03-19T10:54:11+05:30
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.

Hope this helps you....................


Mark it as best if it helps you ............  :-) 


0