The ion in the cathode that gains electrons
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you need to include the bottom portion, not enough info
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answer: they seek to produce verficiable data.
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An acid is a substance that donates protons (in the Brønsted-Lowry definition) or accepts a pair of valence electrons to form a bond (in the Lewis definition). A base is a substance that can accept protons or donate a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.