APFIVE Reactivity as a Periodic Trend
The elements K, Na, Li, Ca, and Mg are listed in a sequence purported to represent increasing reactivity with water. This specific ordering is best explained by which of the following?
A
Competing trends in atomic radius and valence charge
B
Increasing nuclear charge across the periodic table
C
Decreasing electronegativity values
D
Random variations unrelated to periodic properties
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