The diagonal relationship in Be and Al is due to

Step-by-step solution

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 m