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Standard X
Chemistry
Number of Elements in a Period
The question ...
Question

The question refers to the elements of the periodic table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but letters are not the usual symbols of the elements.
Which of these :
(f) have the least atomic size in period 3 ?

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Solution

The element O with atomic number 17 represents the chlorine element which belongs to period 3.
  • It has a high nuclear charge and thus, O has the least atomic size.

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Standard X Chemistry
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