1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: The electron gain enthalpies have large negative values toward the upper right of the periodic table preceding the noble gases. Reason: The effective nuclear charge increases from left to right across a period and consequently it will be easier to add an electron to a smaller atom since the added electron on an average would be closer to the positively charged nucleus.

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Q. Assertion: The electron gain enthalpies have large negative values toward the upper right of the periodic table preceding the noble gases.
Reason: The effective nuclear charge increases from left to right across a period and consequently it will be easier to add an electron to a smaller atom since the added electron on an average would be closer to the positively charged nucleus.

Classification of Elements and Periodicity in Properties

Solution:

The electron gain enthalpies have large negative values towards the upper right of the periodic table preceding noble gases because as we move from left to right in a period atomic radii decreases due to increase in effective nuclear charge due to which electron attracting tendency increases and consequently the electron gain enthalpy have larger negative values.