The value of lattice energy across the period in the periodic table:
Correct answer: A. Increases
- A. Increases
- B. Decreases
- C. Remains same
- D. Changes randomly
Explanation
Across a period, the cation charge rises and the ionic radius falls, from Na plus to Mg2 plus to Al3 plus, so the attraction between ions and the lattice energy both increase. Lattice energy depends on charge divided by distance, so it changes in a regular way rather than randomly.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Lattice Energy
Lattice energy describes the energy released when gaseous ions form one mole of an ionic solid, or the energy required to separate that solid into gaseous ions, depending on the convention used. Its value depends mainly on ionic charge and radius and is calculated through Born-Haber cycles.
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