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flag English language

Which of the following is not a chemical element?
copper
iron
brass
chromium
Copper, iron and chromium are chemical elements. Brass is a metal alloy made of copper and zinc.
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Very interesting!

flag Polish language

Które z poniższych nie jest pierwiastkiem chemicznym?
miedź
żelazo
mosiądz
chrom
Miedź, żelazo oraz chrom to pierwiastki chemiczne. Mosiądz to stop miedzi i cynku.
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Very interesting!

flag German language