How would u justify the presence of 18 elements in fifth period of the periodic table ?
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in period 5 , all the elements will have 5 principal shells; for n=5, I. e in 5th ahell maximum no of electrons that can have for any element is 2^5 i.e 32 , there are d & f subshell so no of elements in 5th &4th period is 18, no of elements in 3rd & 2nd period is 8 while in 1st period no of element is 2 & no of elements in 6th period is 32; no of elements in 7th period is 50 (not yet fully filled up, one by one being filled up)
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