22.  The atomic number of the atom which becomes stable by gaining 3 electrons in 5th sehll is-
(A) 56
(B) 49
(C) 51
(D) 54

Dear Student,


The electronic configuration is stable species 2, 8, 18, 18, 8.

Hence electronic configuration is atom become stable with gaining 3 electrons in 5th  shell is
2, 8, 18, 18, 5 and the atomic number is 51.
 
Hence option (c) 51 is Correct.
 
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