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Physics, 29.10.2020 23:00 donyaic3

2. Analyze the following pairs of elements, and determine whether each pair has similar or different reactivities.
a. potassium, K, and rubidium, Rb
b. calcium, Ca, and barium, Ba
C. sodium, Na, and chlorine, CI
d. helium, He, and krypton, Kr

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