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The atomic number of In is 49.It belongs to

$\begin{array}{1 1}\text{4th period}\\\text{5th period}\\\text{6th period}\\\text{3rd period}\end{array} $

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Answer : 5th period
Atomic number 49=2+8+8+18+13.
Hence,it belongs to 5th period and 13th group.
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