AP EAMCET · Chemistry · Structure of Atom
The ratio of radii of second orbit of hydrogen atom to fourth orbit of \(\mathrm{He}^{+}\)ion is
- A \(1: 4\)
- B \(2: 1\)
- C \(1: 2\)
- D \(2: 3\)
Answer & Solution
Correct Answer
(C) \(1: 2\)
Step-by-step Solution
Detailed explanation
For hydrogen and hydrogen like atoms \(r_n=n^2 / Z\) where, \(r_n\) is radius of \(n\)th orbit of revolution of electron, \(Z\) is the atomic number. For hydrogen atom, \(Z=1\). Hence, radius of second orbit is \(r_2=\frac{(2)^2}{1}=4\) For helium atom, \(Z=2\). Hence, radius of…
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