Multiple choice

Which period is incomplete in the periodic table?

  1. First period

  2. Second period

  3. Seventh period

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. It starts with element Francium. This period contains the heaviest element which occurs naturally on earth, uranium. Most of the subsequent elements in this period have been synthesized artificially and on many  elements of this period work is still going on in the lab.  All elements are radioactive in this period.

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