Science Quiz / Which Element?: Atomic Number

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Can you choose which element has the higher atomic number?

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Also try: Fast Math II
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1st Element (1)Answer2nd Element (2)
UraniumLead
SilverTin
HeliumNitrogen
SiliconCalcium
BismuthOsmium
AluminumArgon
IodineSamarium
RadiumRutherfordium
KryptonIron
TungstenXenon

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