Question

Give the number of elements in 2nd and 5th period in Modern Periodic Table.

Answer 1

2nd period contains 8 elements..
5th period contains 18 elements...

Answer 2

2nd period =Beryleium(Be) , Magnesium (Mg) , Calcium (Ca) , Strontium (Sr) , Barium (Ba) , Radium (Ra)
5th period =Nitrogen (N),Phosphorus (P),Arsenic (As), Antinomy (Sb) ,Bismuth (Bi) , Ununhexium (Uup)