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Q. In the modern periodic table, calcium (atomic number = 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium? Explain configuration of 38. From which point this type of configuration starts ? What is the maximum no. of electrons a shell can acquire at this point?

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Solution

Dear student,
The configuration of element having 38 atomic no. is 2 , 8 , 18 , 8 , 2
The 3rd shell can accommodate 18 electrons in the three subshells i.e. s , p , and d. This will start with the atomic number 29 element i.e. Cu.
At this point a shell can acquire maximum of 18 electrons.
Regards

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