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Question

What is the atomic number of another element present in the same group as the element with Z=13?
  1. Z=32
  2. Z=50
  3. Z=49
  4. Z=20

A
Z=32
B
Z=50
C
Z=49
D
Z=20
Solution
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An element having atomic no. 13 is present in the 3rd period. Now, next element will have atomic number 13+18=31. After that element, another element will have atomic number 31+18=49.

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