Question:medium
The correct order of the first ionization enthalpy is
The correct order of the first ionization enthalpy is
Updated On: Mar 19, 2026
- Al > Ga > Tl
- Ga > Al > B
- B > Al > Ga
- Tl > Ga > Al
Show Solution
The Correct Option is D
Solution and Explanation
(i) Thallium (Tl) exhibits a greater first ionization enthalpy than gallium (Ga) and aluminum (Al) because the lanthanide contraction leads to an elevated effective nuclear charge, thereby augmenting ionization energy.
(ii) Analogously, the scandide contraction elevates gallium's ionization energy above that of aluminum, attributable to a comparable surge in effective nuclear charge that impedes electron removal.
Was this answer helpful?
0
Top Questions on Classification of elements and periodicity in properties
- Among the following the isoelectronic species are
I. $Mg^{2+}, Al^{3+}, F^-$
II. $O^{2-}, F^-, N^{3-}$
III. $K^+, Ca^{2+}, Sc^{3+}$
IV. $Mn^{2+}, Fe^{3+}, V^{3+}$- TS EAMCET - 2025
- Chemistry
- Classification of elements and periodicity in properties
- Identify the correct orders regarding atomic radii
i. $\text{Cl}>\text{F}>\text{Li}$
ii. $\text{P}>\text{C}>\text{N}$
iii. $\text{Tm}>\text{Sm}>\text{Eu}$
iv. $\text{Sr}>\text{Ca}>\text{Mg}$- TS EAMCET - 2025
- Chemistry
- Classification of elements and periodicity in properties
- In hydrogen atom, an electron is transferred from an orbit of radius $1.3225$ nm to another orbit of radius $0.2116$ nm. What is the energy (in J) of emitted radiation? (Rydberg constant $R_H \approx 1.097 \times 10^7 \text{ m}^{-1}$)
- TS EAMCET - 2025
- Chemistry
- Classification of elements and periodicity in properties
- Match the following
- TS EAMCET - 2025
- Chemistry
- Classification of elements and periodicity in properties
- Want to practice more? Try solving extra ecology questions todayView All Questions
