Periodic Classification of Elements
The third ionization enthalpy is minimum for :
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Multiple Choice
The first ionization energy of oxygen is less than that of nitrogen. Which of the following is/are the incorrect reason(s) for this observation ?
ALesser effective nuclear charge of oxygen than nitrogen
BLesser atomic size of oxygen than nitrogen
Correct Answer
CGreater inter-electron repulsion between two electrons in the same p-orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen
DGreater effective nuclear charge of oxygen than nitrogen
Correct Answer
Solution
The first ionization energy of oxygen is less than that of nitrogen because as we from left to right the atomic size decreases. Therefore ionization energy will be increased. But in case of oxygen and nitrogen the greater inter-electron repulsion between two electrons in the same p-orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen.
Hence options B & D are correct.
SIMILAR QUESTIONS
Periodic Classification of Elements
The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are:
Periodic Classification of Elements
Which of the following represents the correct order of increasing first ionization enthalpy for $$Ca$$, $$Ba$$, $$S$$, $$Se$$ and $$Ar$$?
Periodic Classification of Elements
In which of the following options the order of arrangement does not goes with the variation of property indicated against it?
Periodic Classification of Elements
Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.
Periodic Classification of Elements
In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?
Periodic Classification of Elements
The element having very high ionization enthalpy but zero electron gain enthalpy is :
Periodic Classification of Elements
The first ionisation potential of $$Na, Mg, Al$$ and $$Si$$ are in the order:
Periodic Classification of Elements
In which of the following transformation least energy is required?
Periodic Classification of Elements
Which of the following electronic configuration is associated with the biggest jump between the second and third ionization energies?
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