What does “Atomic radius trend” actually mean in Periodic Table & Periodicity, and why does it matter for NEET?
atomic size decreases across a period (more nuclear pull) and increases down a group (new shells).
In simple words: atomic size decreases across a period (more nuclear pull) and increases down a group (new shells). Getting Atomic radius trend clear matters because NEET questions on Periodic Table & Periodicity usually test this idea directly, not just a formula you memorised.
Key point
Atomic radius trend
Common mistake
reversing the across-a-period trend.
Memory tip
more protons but the same shell → electrons pulled in tighter across a period.
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