The atomic number of indium which belongs to 5th period is

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answer is C.

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Detailed Solution

Indium is a chemical element with the symbol In and atomic number 49. This rare, very soft, malleable and easily fusible other metal is chemically similar to gallium and thallium, and shows the intermediate properties between these two.

The atomic number of indium is 2 + 8 + 8 + 18 + 13 = 49.

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