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Question

Give a reason why :

(a) completion of each period is logical.

(b) period-2 elements are called ‘bridge elements’.

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Answer

(a) Completion of each period is logical, since each period begins with an element having one electron in the outer most shell and ends with zero group element having completely filled outer shell.

(b) The elements of the second period show resemblance in properties with the elements of the next group of third period, due to very less electronegativity difference. This leads to a diagonal relationship, viz. Li and Mg, Be and Al, B and Si. These elements are hence called Bridge elements.

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