Periodic Properties

________ earth elements and metals are a collection of sixteen chemical elements in the periodic table, namely scandium, yttrium, and fourteen of the fifteen lanthanoids (excluding promethium), which naturally occur on the Earth.

One 1 2 3 4 5 6 7 8 9
Two 10 11 12 13 14 15
Three 16 17 18 19 20
Four 21 22 23 24 25 26 27
  
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