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The fifth period of modern periodic table includes

$\begin{array}{1 1}\text{8 elements}\\\text{18 elements}\\\text{32 elements}\\\text{unknown elements}\end{array} $

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Answer : 18 elements
The fifth period includes 18 elements due to filling of 5s,4d and 5p orbitals.
answered Jul 25, 2014 by sreemathi.v

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