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CBSE Class 11-science Answered

There are only 18 elements in the fifth period of the periodic table. Justify this statement.
Asked by Topperlearning User | 27 Jun, 2016, 12:47: PM
answered-by-expert Expert Answer

The fifth period begins with the filling of 5f orbital and continues till the filling of sixth energy (6s) starts. The sub shells that follow up the filling pattern are 4d, 5p, 6s…

So we can say that the elements which involve filling of 5s, 4d and 5p sub shell are accommodated in the fifth period .The total number of orbitals which these sub shell can have is nine and these orbitals  can accommodate 18  electrons. So there are 18 elements in the fifth period.
Answered by | 27 Jun, 2016, 02:47: PM

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