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Q.What is the basic difference between the term electron gain enthalpy and electronegativity?

Assam AhsecAHSEC Higher Secondary (HS) 1st Year Examination 2026Subjective· 2mImportance★★★★★
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Electron gain enthalpy = energy change of a free gaseous atom gaining an electron; electronegativity = relative electron-attracting power of a bonded atom.

Electron gain enthalpy (delta-eg H):

  • It is the enthalpy change when one mole of gaseous atoms accepts electrons to form gaseous anions: X(g) + e- -> X-(g).
  • It refers to an isolated (free) gaseous atom.
  • It is a measurable quantity with definite units (kJ/mol) and a definite sign.

Electronegativity:

  • It is the tendency of an atom to attract the shared pair of bonding electrons towards itself in a covalent bond.
  • It is a property of an atom in the combined (bonded) state, not of an isolated atom.
  • It is a relative number (e.g. on the Pauling scale), not an absolute measurable energy, and has no units. …

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