If electron are filled in element not by ( n + l ) rule but as 1 s , 2 s , 2 p , 3 s , 3 p , 3 d , 4 s … . and one period will start as usual while completes on completion of respective shell, then pr

Question

If electron are filled in element not by ( n + l ) rule but as 1 s , 2 s , 2 p , 3 s , 3 p , 3 d , 4 s … . and one period will start as usual while completes on completion of respective shell, then predict the period of element having atomic number 59.

TestHub · Accepted Answer

The filling order 1 s , 2 s , 2 p , 3 s , 3 p , 3 d , 4 s … means shells fill completely. Z=59: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 10 4 f 9 . The highest principal quantum number is 4, so the period is 4.

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