Question:

The energy of electron in 1st orbit of Hydrogen atom is –2.18 × 10-18 Joule. The third ionisation energy of Li+2 ion is

Updated On: Apr 24, 2024
  • (A) 8.72 × 10-18 J
  • (B) 4.36 × 10-18 J
  • (C) 19.62 × 10-18 J
  • (D) 6.54 × 10-18 J
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The Correct Option is C

Solution and Explanation

Explanation:
III lonisation energy of Li+2 =Z2n2E1H′ where (Z=3,n=1)=−Z2×2.18×10−18n2 Julen=1 for third ionisation.=−(−9×2.18×10−18)=19.62×10−18J
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