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The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p3. What is the atomic number of the element, which is just below the above element in the periodic table?

1. 33
2. 34
3. 36
4. 49

Correct answer: 34

Solution

The given electronic configuration corresponds to atomic number 15 (phosphorus). The element just below phosphorus in the periodic table is sulfur, which has an atomic number of 16. Therefore, the atomic number of the element below sulfur is 34.

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