Question

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Answer 1

Answer:

Electronic Configuration of the atom having atomic number 57 by the Aufbau's Principle is, 1s

2

2s

2

2p

6

3s

2

3p

6

3d

10

4s

2

4p

6

4d

10

5s

2

5p

6

5d

1

6s

2

Now, The Period of the Element is 6th.Block of the element will corresponds to that shell which receives the last electrons.Since, the last electrons is received by the 5d subshell, therefore, the block the given element is the d.

Hence option C is correct

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