Question
The energy of an electron in the ground state (n=1) for He ^ + ion is -x J, then that for an electron in n=2 state for Be ^ 3+ ion in J is
NEET
Chemistry
Structure of Atom
2024
NEET 2024
NEET Chemistry Question (2024) — Solution
Options
- A. - x 9
- B. -4 x
- C. - 4 9 x
- D. -x
Answer
D. -x
Step-by-step solution
E_n=-R_H ( z^2 n^2 ) J For He ^ + (n=1), aligned & E_n=-x=-R_H ( 2^2 1^2 )=-4 R_H \\ & R_H= x 4 \\ & aligned For Be ^ 3+ (n=2), aligned E_n & =-R_H ( z^2 n^2 ) J \\ & =- x 4 ( 4 4 2 2 )=-x J aligned
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