When an electron is added to O- then the energy change is expressed by:
Correct answer: A. Electron affinity
- A. Electron affinity
- B. Energy release
- C. Energy absorption
- D. Both options A and C are correct
Explanation
Electron affinity is defined as the energy change that occurs when a gaseous atom gains one electron to form a negatively charged ion. In the case of adding an electron to an oxygen atom (O), O gains an electron to become an oxygen anion (O⁻). Therefore, the process of adding an electron to O- is described by its electron affinity.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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