Chemistry · Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity
Why is there a gradual increase in the ionisation energy from to
Why is there a gradual increase in the ionisation energy from \( L i \) to \( N e ? \)
- A. Increase in atomic size
- B. Decrease in nuclear charge
- C. Atomic size remains same
- D. Increase in nuclear charge
Step-by-step solution
Across the period from Li to Ne, electrons are added to the same valence shell while the nuclear charge (number of protons) increases. This leads to a greater effective nuclear charge experienced by the valence electrons, making them more tightly bound and thus requiring more energy to remove. Consequently, ionization energy increases gradually.
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