The element with positive electron gain enthalpy is_________.The electron affinity for the inert gases is __________.

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Q1: The element with positive electron gain enthalpy is
(a) hydrogen 
(b) sodium
(c) oxygen 
(d) neon

Q2:The electron affinity for the inert gases is –
(a) zero 
(b) high
(c) negative 
(d) positive_

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: Answer 1: [d] neon

Answer 2: [a] zero

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NCERT REFERENCE

 Noble gases have large positive electron gain enthalpies because the electron has to enter the next higher principal quantum level leading to a very unstable electronic configuration.

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the negative of the enthalpy change for the process depicted in equation 3.3 is defined as the ELECTRON AFFINITY (Ae ) ___________________

SUB-TOPIC:

• 3.7.1 Trends in Physical Properties
• (d) Electron Gain Enthalpy
• (e) Electronegativity

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