Potassium and sodium show similar chemical properties because they?

CHEMISTRYWAEC 1988

A. belong to the same group in the Periodic table
B. have equal number of electrons in their outermost shells.
C. both exist in the + 1 oxidation state in their compound
D. belong to the same period in the Periodic Table

Correct Answer: D. belong to the same period in the Periodic Table

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