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

$\begin {array} {1 1} (A)\;47 & \quad (B)\;48 \\ (C)\;49 & \quad (D)\;50 \end {array}$

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The atomic number of indium is 2+8+8+18+13 = 49
Hence (C) is the correct answer.
answered Jul 24, 2014 by thanvigandhi_1
 
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