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Be and Al are placed in different period...

`Be` and `Al` are placed in different periods and groups but they show the similar properties. Explain.

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It is due to diagonal relationship. On moving across a period the charge on the ions increases and the size decreases, causing the polarising power to increase. On moving down a group the size increases and polarising power decreases. On moving diagonally, i.e. from `Be` to `Al` these two effects partly cancel each other and so there is no marked change in properties of diagonal elements as shown below :
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