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Question

The trend in atomic radii on moving down a group, with reference to the alkali metals in Group-1[I A]
  1. increases
  2. decreases
  3. remain constant
  4. none of these

A
increases
B
none of these
C
remain constant
D
decreases
Solution
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Moving down a group in the periodic table, the number of electrons and filled electron shells increases, but the number of valence electrons remains the same. The outermost electrons in a group are exposed to the same effective nuclear charge, but electrons are found farther from the nucleus as the number of filled energy shells increases. Therefore, the atomic radii increase.
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