The incorrect decreasing order of atomic radii is:
Show Hint
Mg>Al>C>O
Al>B>N>F
Be>Mg>Al>Si
Si>P>Cl>F
The Correct Option is C
Solution and Explanation
The atomic radius decreases across a period from left to right due to the increase in effective nuclear charge, but increases down a group due to the addition of electron shells.
Step 1: \( \text{Be} > \text{Mg} > \text{Al} > \text{Si} \) is incorrect because atomic radius decreases as we move from \( \text{Be} \) to \( \text{Si} \).
Final Conclusion: The incorrect order is Option (3), \( \text{Be} > \text{Mg} > \text{Al} > \text{Si} \)
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