Question detail
What is the equation for the first ionisation energy of an atom?
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. X(g) → X+(g) + e-
- B. X(g) + e- → X-(g)
- C. X+(g) + e- → X(g)
- D. X(g) + X(g) → 2X(g)
Answer
X(g) → X+(g) + e-
Explanation
The equation for the first ionisation energy represents the process where an electron is removed from a neutral atom in the gas phase, forming a positively charged ion. This is a fundamental concept in understanding ionisation energies.
Common mistake
Common Mistake in Writing Ionisation Equations
Students often forget to include the correct charge on the ion when writing equations for first and successive ionisation energies.
To fix this, remember that the first ionisation energy equation for an atom X should be written as: X(g) → X⁺(g) + e⁻. For successive ionisation energies, include the charge of the ion formed. For example, the second ionisation energy would be: X⁺(g) → X²⁺(g) + e⁻. Always ensure to indicate the state of the atom and the charge of the ions.
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