Question detail
Explain how first ionisation energy provides evidence for the existence of electron shells.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Atomic structure
Question
Explain how first ionisation energy provides evidence for the existence of electron shells.
Answer
First ionisation energy increases across a period due to increased nuclear charge, which holds electrons more tightly. This trend supports the existence of electron shells, as electrons in the outer shell are further from the nucleus and experience less attraction, making them easier to remove.
Explanation
This answer is strong because it links the trend in first ionisation energy to the concept of electron shells, demonstrating an understanding of atomic structure. The question tests the student's ability to connect ionisation energy trends with theoretical models of atomic structure.
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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