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