1 Classification of Elements and Periodicity
The radii of the first Bohr orbit of H(rH?), He+(rHe?) and Li2+($$r^{2+}_{Li}$$) are in the order: 1) $$ r^{+}_{He} > r_{H} > r^{2+}_{Li}$$ 2) $$r_{H} < r^{+}_{He}< r^{2+}_{Li}$$ 3) $$r_{H} > r^{+}_{He} > r^{2+}_{Li} $$ 4) $$r^{+}_{He} < r_{H} <? r^{2+}_{Li} $$
SOLUTION
r = $$0.529 × \dfrac {n^{2}A^{0}}{Z}$$
Where
r= radius of of orbit
n = prinicipal quantum number of orbit.
Z = atomic number
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