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  9. Q421

RRB Junior Engineer / DMS / CMA 2015 · Question 421 of 480

The electronic configuration of an element is 2, 7. In which group of the modern periodic tale is this element placed?

  1. A7Correct
  2. B9
  3. C15
  4. D1

Answer: A. 7

Official answer key verified. Detailed explanation coming soon.

Source: RRB JE 28-August Shift question paper with solutions — splessons.com · reliable-secondary

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