Atomic radii of the elements of the second period are given below:

Atomic radii of the elements of the second period are given below:

(i) Arrange them in decreasing order of their atomic radii.
(ii) Are the elements now arranged in the pattern of a period in the Periodic Table ?
(iii) Which elements have the largest and the smallest atoms ?
(iv) How does the atomic radius change as you go from left to right in a period?

(i) The elements of second period in the decreasing order of their atomic radii are:
Li Be B C N O
152 111 88 77 74 66
(ii) Yes, the above elements are arranged in the pattern of a period in the periodic table.
(iii) Li has the largest (152 pm) and O has the smallest (66 pm) atoms.
(iv) The atomic radii decrease as we move from left to right in a period due to a corresponding increase in their nuclear charge.