The energy required to remove the most loosely bound electron from a gaseous atom is called
Correct answer: B. ionisation energy
- A. electron affinity
- B. ionisation energy
- C. electronegativity
- D. lattice energy
Explanation
Ionisation energy is always endothermic because work must be done against the nuclear attraction, and it rises steeply for each successive electron removed. Electron affinity is the energy change when an electron is added instead, and electronegativity describes the pull on shared electrons within a bond. All three are distinct and are regularly confused.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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