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Modern Periodic Table — Chemistry STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryModern Periodic Table4 Marks
Question
Explain : electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?
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Answer

i. The ability of a covalently bonded atom to attract the shared electrons toward itself is called electronegativity (EN). Electronegativity cannot be measured experimentally. However, various numerical scales to express electronegativity were developed by many scientists. Pauling scale of electronegativity is the one used most widely.

ii. Electron gain enthalpy is a quantitative measure of the ease with which an atom adds an electron forming the anion and is expressed in kJ mol-1. Thus, it is an experimentally measurable quantity.

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