Chemistry — Reactivity Series
Metals ordered by reactivity, most to least.
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digraph Reactivity {
rankdir=TB;
node [shape=box, style=rounded];
"Potassium" -> "Sodium" -> "Calcium" -> "Magnesium" -> "Aluminium";
"Aluminium" -> "Zinc" -> "Iron" -> "Lead" -> "Copper" -> "Silver" -> "Gold";
"Potassium" [label="Potassium (most reactive)"];
"Gold" [label="Gold (least reactive)"];
}