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flag English language

Which letter is not used as a symbol of a chemical element?
A
B
C
Y
B is the chemical symbol of boron, C - carbon, Y - yttrium.
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Very interesting!

flag Polish language

Która litera nie jest używana jako symbol pierwiastka chemicznego?
A
B
C
Y
B to symbol chemiczny boru, C - węgla, Y - itru.
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Very interesting!