Atomic radii of the elements of the second period are given below :
Period $II$ elements $B$ $Be$ $O$ $N$ $Li$ $C$ Atomic radius $(pm)$ $88$ $111$ $66$ $74$ $152$ $77$
$(i)$ 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?
| Period $II$ elements | $B$ | $Be$ | $O$ | $N$ | $Li$ | $C$ |
| Atomic radius $(pm)$ | $88$ | $111$ | $66$ | $74$ | $152$ | $77$ |
$(i)$ 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?
(A) $(i)$ The elements of the second period in the decreasing order of their atomic radii are:
$(ii)$ Yes,the elements are now arranged in the pattern of a period in the Periodic Table.
$(iii)$ $Li$ has the largest atomic radius $(152\,pm)$ and $O$ has the smallest atomic radius $(66\,pm)$.
$(iv)$ The atomic radius decreases as we move from left to right in a period because the nuclear charge increases,which pulls the electrons closer to the nucleus.
| Element | $Li$ | $Be$ | $B$ | $C$ | $N$ | $O$ |
| Radius $(pm)$ | $152$ | $111$ | $88$ | $77$ | $74$ | $66$ |
$(ii)$ Yes,the elements are now arranged in the pattern of a period in the Periodic Table.
$(iii)$ $Li$ has the largest atomic radius $(152\,pm)$ and $O$ has the smallest atomic radius $(66\,pm)$.
$(iv)$ The atomic radius decreases as we move from left to right in a period because the nuclear charge increases,which pulls the electrons closer to the nucleus.
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