What is the energy associated with the first orbit of $Li^{2+}$ $(R_{H} = 2.18 \times 10^{-18} \ J)$?

• A
  $-8.72 \times 10^{-18} \ J$
• B
  $-34.88 \times 10^{-18} \ J$
• C
  $-2.18 \times 10^{-18} \ J$
• D
  $-19.62 \times 10^{-18} \ J$