Element A and B have atomic number 13 and 27. Write their electronic configurations and predict their period, group and block. Which of them is a transition element?
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Explanation:
Given -
- Atomic number of A is 13 and B is 27
To Find -
- Write their Electronic configuration
- Predict group, period & block
- Which of them is a transition element ?
Solution -
Element A = 13
Electronic configuration = 1s² 2s² 2p⁶ 3s² 3p¹
Element name = Aluminium
Symbol = Al
Period = 3
Group = 13
Block = p-block
And
Element B = 27
Electronic configuration = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d^7
Element Name = Cobalt
Symbol = Co
Period = 4
Group = 9
Block = d-block
Therefore,
Element B (Co) is a transition element.
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