The sub-shells filled one by one for 4th period elements are

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The sub-shells filled one by one for 4^th period elements are

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3d, 4s and 4p

4s, 4p and 4d

4s, 3d and 4p

3d, 4p and 4s

answer is B.

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Detailed Solution

To find the sub-shells filled one by one for 4th period elements from the given options.

Concept to be used:

Longform of Periodic Table

Detailed Solution:

The sub-shells filled one by one for 4-period elements are 4 s, 4 p and 4 d

Nickel, copper, manganese, iron, and titanium are among the transition elements, also referred to as the fourth-period elements.

Therefore, Option B is the correct answer.

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