pl explain for Z=20, how the third shell contain only 8 electrons even when its capacity is 18.

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Solution

Dear student!
Any shell can have a maximum of electrons only when the next shells are filled. We see that,
In Ca (Z= 20) , the electrons are arranged as , 2,8,8,2 and here the next shell is not filled so the 3rd shell has a maximum of 8 electrons. it is rule of filing of electrons.

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pl explain for Z=20, how the third shell contain only 8 electrons even when its capacity is 18.

Dear student!Any shell can have a maximum of electrons only when the next shells are filled. We see that,In Ca (Z= 20) , the electrons are arranged as , 2,8,8,2 and here the next shell is not filled so the 3rd shell has a maximum of 8 electrons. it is rule of filing of electrons.

Dear student!
Any shell can have a maximum of electrons only when the next shells are filled. We see that,
In Ca (Z= 20) , the electrons are arranged as , 2,8,8,2 and here the next shell is not filled so the 3rd shell has a maximum of 8 electrons. it is rule of filing of electrons.