Electronegativity (according to Mulliken scale) is given by
Correct answer: C. Average of ionisation energy and electron affinity
- A. Average of first and second ionisation energies
- B. Average of first and second electron affinities
- C. Average of ionisation energy and electron affinity
- D. None of the above
Explanation
The Mulliken scale of electronegativity calculates the tendency of an atom to attract electrons by averaging its ionisation energy and electron affinity. Ionisation energy is the energy required to remove an electron from an atom, while electron affinity is the energy released when an electron is added to an atom. Option C correctly captures this idea, whereas options A and B focus solely on removal or addition energies, respectively, and option D dismisses the correct option.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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