Multiple choice

Which of the following is not a periodic property?

  1. Electronegativity

  2. Electron affinity

  3. Atomic number

  4. Atomic mass
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D Correct answer
Explanation

Occurrence of different elements with same atomic mass does not form any basis for these to be assigned some particular position in the periodic table. So, it is not a periodic property. This was a major drawback of the periodic table given by Mendeleev, who classified the elements according to their atomic mass. Also, it was observed by Moseley that the physical and chemical properties of elements depend upon the number of electrons in their outermost shell in ground state and not on their atomic masses.

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