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Ionisation energy of Li (Lithium) atom in ground state is 5.4 eV. Binding energy of an electron in Li⁺ ion in ground state is 75.6 eV. Energy required to remove all three electrons of Lithium (Li) atom is

Asked in JEE Main Online 2012 · Energy levels and ionisation

• (1) 81.0 eV
• (2) 135.4 eV
• (3) 203.4 eV
• (4) 156.6 eV

Step-by-step solution

Why the other options are wrong

• (1) Forgets the last electron (122.4 eV).
• (2) Uses a wrong value for the last electron.
• (4) Uses a wrong value for the last electron.

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