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Study
20-40 elements
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Kr
krypton
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Br
bromine
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Rb
rubidium
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Ti
titanium
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Co
cobalt
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Zr
zirconium
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Sr
strontium
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Mn
manganese
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Sc
scandium
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Ge
germanium
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Zn
Zinc
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Cr
chromium
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Se
selenium
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Fe
iron
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Y
yttrium
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As
arsenic
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Cu
copper
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Ga
Gallium
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V
vanadium
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Ni
nickel
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