Atomic Structure Question 421
Question: The energy of $ {e^{-}} $ in first orbit of $ H{e^{+}} $ is $ -871.6\times {10^{-20}}J. $ The energy of $ {e^{-}} $ in first orbit of H is:
Options:
A) $ -871.6\times {10^{-20}} $
B) $ -435.8\times {10^{-20}}J $
C) $ -217.9\times {10^{-20}}J $
D) $ -108.9\times {10^{-20}} $
Show Answer
Answer:
Correct Answer: C
Solution:
- $ {E_{1_{He}}}+={E_{1_{H}}}\times Z^{2} $
$ \therefore -871.6\times {10^{-20}}={E_l} _{H}\times 4 $
$ \therefore {E_l} _{H}=-217.9\times {10^{-20}}J $
