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If what is meant is by mean Atomic Mass , then they almost fall into "groups" or families of elements with similar chemical properties. HOWEVER there are exceptions where the sequence is "odd" notably

  • Argon is heavier than potassium
  • Tellurium is heavier than iodine
  • Thorium is heavier than Protactinium

Putting potassium with the noble gases and argon in the alkali metals would be confusing.

This is why the Periodic Table is sequenced by ATOMIC NUMBER not by mean atomic mass.

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