what is the name of new 115th element in Periodic table ?
Ununpentium.
(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
(b) What is the number of elements in (a) 1st period, and (b) 3rd period, of the modern periodic table?
What is the major characteristic of the first element in the periods of the periodic table? What is the general name of such elements?