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A hydrogen atom, and a doubly ionised lithium (Li)++ atom, are in their first exerted state and the second excited state, respectively. If lH and lLi are the respective angular momenta, and KH , KLi are the, respective, kinetic energies, of the electron, in the two atoms, we can say that 

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Best answer

Correct option : (3)

Explanation :

For the hydrogen atom nH = 2 and zH = 1 

For the doubly ionised lithium atom, we have nLi = 3; and zLi = 3 

According to Bohr’s first postulate, the angular momentum of electron, in an orbit, is directly proportional to n; therefore;

The K.E of the electron, is an orbit, equals the |T.E.| and T.E ∝ z2/n2;  therefore

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