Q. The number of elements present in fifth period of periodic table is :

 1472  210 AFMCAFMC 2003 Report Error

Solution:

Horizontal rows of periodic table are called periods. Modern periodic table has seven periods.
I period - 2 elements
II period - 8 elements
III period - 8 elements
IV period - 18 elements
V period - 18 elements
VI period - 32 elements
VII period - In complete