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Periodic Table, Periodic Properties and Variations of Properties — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryPeriodic Table, Periodic Properties and Variations of Properties1 Mark
MCQ
Ionisation potential increases over a period from left to right because the :
  • A
    Atomic radius increases and nuclear charge increase
  • B
    Atomic radius and nuclear charge decrease
  • C
    Atomic radius increases and nuclear charge decreases
  • ✓
    Atomic radius decreases and nuclear charge increase
✓

Answer

Correct option: D.
Atomic radius decreases and nuclear charge increase
(d) Atomic radius decreases and nuclear charge increase
Explanation : As we move from left to right in a period, electrons are added to the same shell. As the number of electrons and protons goes on increasing the attraction goes on increasing and atomic size decreases. Thus, the outermost shell electrons come closer to the nucleus and are more firmly bound. Thus, more amount of energy is required to remove an electron from the outermost shell and hence, ionisation Potential increases.

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