alleryStart learning →What kind of quantity is the electron affinity of an element?
AA calculated relative index
BA dimensionless ratio of charges
CAn arbitrary scale from zero to four
DA measurable physical quantity
Answer & Solution
Correct answer: D. A measurable physical quantity
1. Electron affinity is the energy released or absorbed when an isolated gas phase atom takes an electron.
2. That is a real physical change, so the quantity can be measured in the laboratory.
3. It is reported in kilojoules per mole, which shows it carries genuine units.
4. The dimensionless calculated index on a zero to four scale is electronegativity, not electron affinity.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 7 "Chemical Bonding and Molecular Geometry", section Electronegativity versus Electron Affinity_
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