To determine which pair of elements would react most easily with each other, we can analyze each option based on their electronegativity and electron configurations:
A. An element with a high electronegativity and an element with a full shell of electrons: An element with a full shell (noble gas) generally does not react easily with other elements because it is already stable.
B. An element with a high electronegativity and a second element with a high electronegativity: If both elements have high electronegativities, they would likely not react well with each other because they would both hold on tightly to their electrons and not easily transfer them.
C. An element with a high electronegativity and an element with a single valence electron: This combination is favorable for reaction. The element with a high electronegativity (often a nonmetal) would readily attract and take the single valence electron from the other element (usually an alkali metal), resulting in the formation of a stable ionic compound.
D. An element with a high electronegativity: This option alone does not indicate any potential for reaction, as it lacks a partner with which to interact.
Based on this analysis, the best option for elements that would react most easily with each other is:
C. An element with a high electronegativity and an element with a single valence electron.
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