Chemistry — Periodic Table Blocks
The s, p, d and f blocks and the elements they contain.
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digraph PeriodicBlocks {
rankdir=LR;
node [shape=box, style="filled,rounded", fillcolor="#e0f2fe"];
"s-block" -> "Alkali & alkaline-earth metals";
"p-block" -> "Nonmetals, halogens, noble gases";
"d-block" -> "Transition metals";
"f-block" -> "Lanthanides & actinides";
}