Apply Bohr’s atomic model to a lithium atom. Assuming that its two $K$-shell electrons are too close to nucleus such that nucleus and $K$-shell electron act as a nucleus of effective positive charge equivalent to electron. The ionization energy of its outermost electron is......$eV$

  • A

    $30.6$ 

  • B

    $3.4$

  • C

    $32.4$ 

  • D

    $13.6$ 

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