Multiple choice

If the values of four quantum numbers n = 4, l = 0, m = 0 and s = +1/2, the element is

  1. K

  2. Na

  3. Cl

  4. Al

  5. C
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A Correct answer
Explanation

n = 4 and l = 0 represent 4s orbital. Since  it is valence electron, so the element belongs to s-block and 4th period of periodic table.
Out of five elements given in options, only two elements belong to s-block, i.e.  Na and K. Give quantum number data for the valence electron fits for sodium, K because it belongs to 4th period.

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