Taking into consideration the period of the elements given below, answer the following questions :
|Elements||Atomic Radius (pm)|
1) Arrange the above elements in a decreasing order of their atomic radii.
2) State the period to which the above elements belong.
3) Why this arrangement of elements period of modern periodic table ?
4) Which of the above elements have the biggest and the smallest atom?
5) What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?