Chemistry — Reactivity Series
Metals ranked from most to least reactive.
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digraph Reactivity {
rankdir=TB;
node [shape=box, style=rounded];
K -> Na -> Ca -> Mg -> Al -> C -> Zn -> Fe -> Pb -> Cu -> Ag -> Au;
K [label="K (most reactive)"];
C [label="Carbon (non-metal reference)"];
Au [label="Au (least reactive)"];
}