How would you justify the preswnce of 18 elements in the 5 period of p

1.	How would you justify the preswnce of 18 elements in the 5 period of periodic table
Answer» It is because 5th period has sub shell 5s,4d,and5p they have 1,5,3 orbitals so they have 2,10, 6 electrons and when we add them =2+10+6=18 electrons. So, by this we say that period 5has 18 elements

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