Question:
Which among the following elements has the highest ionisation enthalpy and bears a diagonal relationship with aluminium?
Which among the following elements has the highest ionisation enthalpy and bears a diagonal relationship with aluminium?
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Beryllium has the highest ionization enthalpy among the elements listed and forms a diagonal relationship with aluminium due to their similar properties.
Updated On: Feb 18, 2026
- Magnesium
- Beryllium
- Calcium
- Lithium
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The Correct Option is B
Solution and Explanation
Step 1: Understanding diagonal relationship.
Diagonal relationship refers to the similarities between elements situated diagonally in the periodic table, typically between elements of the second period and the third period or between the second and third groups. In this case, beryllium (Be) and aluminium (Al) share a diagonal relationship due to their similar chemical properties.
Step 2: Ionization enthalpy.
Beryllium has the highest ionization enthalpy among the elements listed because it is located in the second period and has a small atomic radius, leading to a high effective nuclear charge.
Step 3: Analyzing the options.
(A) Magnesium: Magnesium has a lower ionization enthalpy compared to beryllium.
(B) Beryllium: This is the correct answer, as it has the highest ionization enthalpy among the listed elements and shows diagonal similarity to aluminium.
(C) Calcium: Calcium has a lower ionization enthalpy than both beryllium and magnesium.
(D) Lithium: Lithium has a high ionization enthalpy but does not form a diagonal relationship with aluminium.
Step 3: Conclusion.
The correct answer is (B) Beryllium.
Diagonal relationship refers to the similarities between elements situated diagonally in the periodic table, typically between elements of the second period and the third period or between the second and third groups. In this case, beryllium (Be) and aluminium (Al) share a diagonal relationship due to their similar chemical properties.
Step 2: Ionization enthalpy.
Beryllium has the highest ionization enthalpy among the elements listed because it is located in the second period and has a small atomic radius, leading to a high effective nuclear charge.
Step 3: Analyzing the options.
(A) Magnesium: Magnesium has a lower ionization enthalpy compared to beryllium.
(B) Beryllium: This is the correct answer, as it has the highest ionization enthalpy among the listed elements and shows diagonal similarity to aluminium.
(C) Calcium: Calcium has a lower ionization enthalpy than both beryllium and magnesium.
(D) Lithium: Lithium has a high ionization enthalpy but does not form a diagonal relationship with aluminium.
Step 3: Conclusion.
The correct answer is (B) Beryllium.
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