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Class 11 Tuition > Learn Classification of Elements and Periodicity in Properties > How would you explain the fact that the first ionization...
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How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium?

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As Na is bigger than Mg .so first ionisaton of Na is less than Mg .But in case of second ionisation Na acquires the noble gas congiguration but Mg not So Na is having more ionisation than Mg.
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The effective nuclear charge of an atom is less than that of the actual charge on the nucleus because of the shielding or screening effect of inner core of electron over the valence electrons.
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Related Questions

Which of the following is the correct order of size of the given species?
(a) I>I>I+
(b) I+>I–>I
(c) i>i+>i–
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Correct answer is d
Pinaki
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The size of isoelectronic species-F–, Ne and Na+ is affected by
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Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is
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Jagabandhu
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Which of the following elements can show covalency greater than 4?
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Dear student, Phosphorous has 4 valence electrons present in 3s2 3p3 configuration. For it to have covalency of 5, it need to have valence obitals along with 5 valence electrons. Thus, phosphorous has...
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Which of the following species are not known?
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