Multiple choice

The quantum number for the outer electrons of an atom are given by n = 2 , l = 0 , m = 0 , s = + 1 / 2 . ?

  1. lithium .

  2. beryllium .

  3. hydrogen .

  4. boron .
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A Correct answer
Explanation

this option is correct because , lithium has electronic configuration - 1s2 2s1 . hence according  to the question n = 2 means principle quantum number is 2  . l =0 means ' s ' orbital . s = + 1 / 2 means 1 electrons . all these characters are exhibited by lithium . therefore this option is correct .

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