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Q.
The radius of hydrogen atom is $ 0.53\,\,\mathring{A} $ . The radius of $ _{3}Li^{2+} $ is of:
Rajasthan PMTRajasthan PMT 2006
Solution:
The radius of hydrogen atom $ =0.53\,\,\mathring{A}$
$ _{3}L{{i}^{+2}} $ ion also has only one electron but it has 3 protons in nucleus, hence its electron fells three times more attraction from nucleus in comparison of hydrogen atom. Thus, the radius of $ _{3}Li^{+2} $ will be
$ =\frac{0.53}{3}=0.17\,\mathring{A} $