[填空题]
Estimate the binding energy of y8ztd b*t7p/ehnu;y923a4x(gxu pq gthe third electron in ft1kf;az+ 5x+;y yuuplithium using the Bohr theory. [Hint: Thisu+ paxf51y+tk;zy u;f electron has $n=2$ and "sees" a net charge of approximately $+1e$.] The measured value is $5.36 \, \text{eV}$. eV
