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The long form of the periodic table is c...

The long form of the periodic table is constructed on the basis of repeating electronic …………….. of the atoms when they are arranged in the order of increasing atomic numbers.

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(i) The electronic configuration of an atom is [Z](n-2) f^(14)(n-1)d^(1)ns^(2) . What is the minimum position of the atom in the periodic table and correspondingly what is the atomic number of Z? (ii) Find the number of unpaired electrons in the atom of the element having atomic number 16. (iii) Which of the following ions does not obey Bohr's atomic theory? He^(2+),Li^(2+),B^(3+),Be^(3+) .