Which element is most likely to have chemical properties similar to those of potassium (atomic number 19)?
A)Ar (atomic number 18)
B)Ca (atomic number 20)
C)Sc (atomic number 21)
D)Rb (atomic number 37)
E)Sr (atomic number 38)

Question

Quizplus · Accepted Answer

Rb (atomic number 37) is the best choice as it is located immediately below K in the same group or family in the periodic table, meaning they share similar chemical properties. Rb has one more electron shell than K but has the same valence electron configuration, making it likely to exhibit similar chemical behavior.

Which Element Is Most Likely to Have Chemical Properties Similar