Atomic Structure Result Question 19-1
19. Which hydrogen like species will have same radius as that of Bohr orbit of hydrogen atom?
(2004,1 M)
(a) $n=2, \mathrm{Li}^{2+}$
(b) $n=2, \mathrm{Be}^{3+}$
(c) $n=2, \mathrm{He}^{+}$
(d) $n=3, \mathrm{Li}^{2+}$
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Answer:
Correct Answer: 19. ( b )
Solution:
- Expression for Bohr’s orbit is, $r_n=\dfrac{a_0 n^2}{Z}=a_0$
when $n=2, Z=4$.
BETA
