When an electron is added to Othen 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
When an electron is added to an atom, the energy change associated with this process is known as the electron affinity. Electron affinity represents the energy released (or absorbed) when an atom in the gaseous phase gains an electron to form a negatively charged ion (anion). It is typically expressed in units of kilojoules per mole (kJ/mol) or electron volts (eV).For oxygen (O), the electron affinity is defined as the energy change when an electron is added to an oxygen atom in the gaseous state to form the oxygen anion (O^-). The electron affinity of oxygen is a negative value, indicating that energy is released when oxygen gains an electron.
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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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