Question detail
What is the definition of first ionisation energy?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atomic structure
Question
- A. The energy required to remove the first electron from an atom in the gaseous state.
- B. The energy required to remove all electrons from an atom in the gaseous state.
- C. The energy released when an electron is added to an atom in the gaseous state.
- D. The energy required to remove the first electron from an ion in the gaseous state.
Answer
The energy required to remove the first electron from an atom in the gaseous state.
Explanation
First ionisation energy is defined as the energy needed to remove the most loosely bound electron from a neutral atom in the gaseous state, which is crucial for understanding atomic structure and reactivity.
Common mistake
Confusing Ionisation Energy Definition
Students often confuse first ionisation energy with other forms of energy, such as total energy or binding energy.
First ionisation energy is defined as the energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous ions. To clarify, remember the formula: Ionisation Energy = Energy required to remove an electron from an atom. For example, for a sodium atom (Na), the first ionisation energy can be expressed as Na(g) → Na⁺(g) + e⁻. This shows that energy is needed to remove the electron, which is the essence of ionisation energy.
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