The incorrect decreasing order of atomic radii is:

Question

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Strategy:
 Verify each atomic radius order. Atomic size increases down groups and decreases across periods.

Step 1: Evaluate option (c)
- "Decreasing order": .
- This implies Beryllium () is larger than Magnesium ().
- Since  is below  in Group 2,  has more shells and must be larger.
Thus, the sequence  is incorrect.

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