A lithium atom has three electrons. Assume the following simple picture of the atom. Two electrons move close to the nucleus making up a spherical cloud around it and the third moves outside this clou

Question

A lithium atom has three electrons. Assume the following simple picture of the atom. Two electrons move close to the nucleus making up a spherical cloud around it and the third moves outside this cloud in a circular orbit. Bohr's model can be used for the motion of this third electron but $n = 1$ state is not available to it. The ionization energy of lithium in ground state, using the above picture, is

Prashant Kotian · Accepted Answer

Correct answer: C. The third electron experiences an effective nuclear charge (since nucleus is shielded by two inner electrons). For this electron, the available ground state is . eV. Therefore, correct answer is C.

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