Question detail
Write the equation for the second ionisation energy of magnesium (Mg).
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
Write the equation for the second ionisation energy of magnesium (Mg).
Answer
Mg⁺(g) → Mg²⁺(g) + e⁻
Explanation
This answer is strong as it correctly shows the removal of a second electron from a singly charged magnesium ion to form a doubly charged magnesium ion. The question assesses the student's knowledge of successive ionisation energies and their ability to formulate the corresponding equations.
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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