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20-40 elements

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  • Sr
    strontium
  • Ge
    germanium
  • Zr
    zirconium
  • Br
    bromine
  • As
    arsenic
  • Ti
    titanium
  • Kr
    krypton
  • Rb
    rubidium
  • Cu
    copper
  • Co
    cobalt
  • Sc
    scandium
  • Cr
    chromium
  • Fe
    iron
  • V
    vanadium
  • Ga
    Gallium
  • Se
    selenium
  • Zn
    Zinc
  • Ni
    nickel
  • Y
    yttrium
  • Mn
    manganese
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