NEET 2003
- Exam
- NEET
- Year
- 2003
- Subject
- Physics
- Chapter
- Atomic Physics
NEET 2003 · Physics · Atomic Physics
In which of the following systems will the radius of the first...
In which of the following systems will the radius of the first orbit be minimum?
Options
- ADoubly ionized lithium
- BSingly ionized helium
- CDeuterium atom
- DHydrogen atom
Correct answer
A. Doubly ionized lithium
Step-by-step solution
Radius of the first orbit of an atom (R_1=\frac{0.529}{Z} A^{\circ})
(\Rightarrow \mathrm{R}_1 \propto \frac{1}{\mathrm{Z}})
where is the atomic number of Hydrogen-like atom.
Since is maximum for doubly ionized lithium, thus radius of first orbit is minimum in doubly ionized lithium.