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- #Classification of elements and periodicity in properties
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Which among the following statement is incorrect?
The ionization energy of nitrogen is greater than that of oxygen
The electron affinity of fluorine is greater than that of chlorine
The ionization energy of Mg is greater than aluminium
The electronegativity of fluorine is greater than that of chlorine
Answers (1)
I.E. of N is more than I.E. of O due to higher stability of half filled outer most sub-shell of N, leading to difficulty in removing the electron.
Due to small size of fluorine atom, surface charge density increases substantially. So, it can not readily accommodate more number of electrons, in fact it repulses new electrons.
Hence, electron affinity of Fluorine is less than chlorine because of smaller size.
As we move from left to right across a period, the ionisation energy increases with decrease in size.
Hence option 2 is correct.
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