1) Odd one out? a) potassium b) magnesium c) caesium d) sodium 2) Odd one out? a) krypton b) argon c) hydrogen d) helium 3) Odd one out? a) carbon b) cobalt c) copper d) chromium 4) Odd one out? a) fluorine b) argon c) xenon d) bromine 5) Odd one out? a) N b) O c) P d) B

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