Electron gain enthalpy is an important periodic property. 1. What is

1.	Electron gain enthalpy is an important periodic property. 1. What is meant by electron gain enthalpy?2. What are the factors affecting electron gain enthalpy? 3. How electron gain enthalpy varies on moving across a period? Justify.
Answer» 1. Electron gain enthalpy(∆_egH) is the enthalpy change accompanying the process of addition of an electron to a neutral gaseous atom to convert it into a negative ion. 2. Effective nuclear charge, atomic size, electronic configuration 3. Electron gain enthalpy becomes more negative with increase in the atomic number across a period. 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 nucleus. Thus more energy is released.

Electron gain enthalpy is an important periodic property. 1. What is meant by electron gain enthalpy?2. What are the factors affecting electron gain enthalpy? 3. How electron gain enthalpy varies on moving across a period? Justify.

Answer»

1. Electron gain enthalpy(∆_egH) is the enthalpy change accompanying the process of addition of an electron to a neutral gaseous atom to convert it into a negative ion.

2. Effective nuclear charge, atomic size, electronic configuration

3. Electron gain enthalpy becomes more negative with increase in the atomic number across a period. 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 nucleus. Thus more energy is released.

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