MHT CET · Chemistry · s Block Elements
The diagonal relationship in Be and Al is due to
- A Similar ionisation enthalpy
- B Similar metallic character
- C Similar ionic size and charge/radius ratio
- D Anthraquinone
Answer & Solution
Correct Answer
(C) Similar ionic size and charge/radius ratio
Step-by-step Solution
Detailed explanation
The diagonal relationship in Be and Al is due to similar ionic size and charge/radius ratio. Generally, on moving from left to right across a period the ionic charge/radius ratio. Period, the ionic charge increase to maximum and then decreases, while the ionic size decreases causing an increase in its polarising power (Fajan’s). on the other hand, on moving down a group the ionic charge remains the same while ionic size increases. Therefore, polarising power decreases. On moving diagonally, therefore, there is no marked change in their properties.
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