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Chemistry · PYQ NEET UG 2024
हिन्दीThe energy of an electron in the ground state (\( n = 1 \)) for \( \text{He}^+ \) ion is \( -x\text{ J} \), then that for an electron in \( n = 2 \) state for \( \text{Be}^{3+} \) ion in J is :
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Correct answer · Option C
\( -x \)
Explanation
Energy \( E \propto \frac{Z^2}{n^2} \). For \( \text{He}^+ \) (\( Z=2, n=1 \)), \( E = -K \frac{2^2}{1^2} = -4K = -x \text{ J} \). For \( \text{Be}^{3+} \) (\( Z=4, n=2 \)), \( E = -K \frac{4^2}{2^2} = -4K = -x \text{ J} \).
