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  • Periodic Classification of Elements - 1
  • Which of the following elements has the least number of s...
Multiple choice

Which of the following elements has the least number of shells in its atom?

  1. Na

  2. Ca

  3. Ga

  4. Ba

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A Correct answer
Explanation

Moving down the period, number of shells increases, as helium (He) belongs to period (I) thus it has least number of shells.

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