Question

which is the last element of the periodic table

Answer 1

In modern periodic table, we have 7 periods and 18 groups.
In the 7th period [incomplete period], the last known element has 118 atomic number.
ununoctium -symbol-Uuo discovered in 1999

Answer 2

Ununoctium
--------------------------------------------------------------------------------------------------------------------

-->Ununoctium is the last element of the periodic table.

-->Its atomic no: is 118

-->Its atomic mass = 294

-->Its symbol is Uuo.

-->It was discovered by a Yuri Ogabessian

-->It is also known as eka-radon.