MCQ
What is the wavelength of light required to raise an electron in the $O^{7+}$ ion from $n=1$ to shell to $n=2$ shell ............... $\mathrm{nm}$
- A$3.8$
- B$38$
- C$19$
- ✓$1.9$
✓
Answer
Correct option: D.
$1.9$
d
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