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The energy levels for $_z{A^{( + Z - 1)}}$ can be given by

• ✓
  ${E_n}\,for\,{A^{( + Z - 1)}} = {Z^2} \times {{\text{E}}_n}{\text{ for H}}$
• B
  ${E_n}\,for\,{A^{( + Z - 1)}} = {Z} \times {{\text{E}}_n}{\text{ for H}}$
• C
  ${E_n}\,for\,{A^{( + Z - 1)}} = \frac{1}{{{Z^2}}} \times {{\text{E}}_n}{\text{ for H}}$
• D
  ${E_n}\,for\,{A^{( + Z - 1)}} = \frac{1}{{{Z}}} \times {{\text{E}}_n}{\text{ for H}}$