The radius of which of the following orbit is same as that first Bohr'

1.	The radius of which of the following orbit is same as that first Bohr's of hydrogen atom ?
Answer» `He^(+) (n =2)` `Li^(2+) (n =2)` `Li^(2+) (n = 3)` `Be^(3+) (n = 2)` SOLUTION :`r_(n) = (0.529 n^(2))/(Z) Å` `:. r_(1) (H) = (0.520 xx 1^(2))/(1) = 0.529 Å` `r_(2) (Be^(3+)) = (0.520 xx 2^(2))/(4) = 0.529 Å`

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