Calculate the value of \( A \). \( \mathrm{P} \) \( A=\frac{E_{1,2}...

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Calculate the value of \( A \).
\( \mathrm{P} \)
\( A=\frac{E_{1,2}}{2 E_{2,1}} \) where \( E_{n, Z}= \) Energy of electron in \( n^{\text {th }} \) orbit, \( Z= \) atomic number of hydrogen like
W. species.
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