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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
Which among the following elements has the largest atomic radii?
  1. Na.
  2. Mg.
  3. K.
  4. Ca.
✓

Answer

  1. K.

Solution: Na and K belong to the same group. i.e. Group I. Ca and Mg belong to the Group II. The atomic radius decreases in moving from left to right along a period. This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom. Hence K has largest atomic radii.

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