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Observe the figure and answer the following questions.

(a) Identify the block shown by box A and write an electronic configuration of any one element of this block.

(b) Identify the block of element denoted by letter B and write its period number.

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(a) The block shown by box A is the s-block.

Electronic configuration of Mg: 2, 8, 2.

(b) The block of element denoted by letter B is the d-block and its period number is 4.

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