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Aluminum was named for one of its most important compounds, alum, a compound of potassium, aluminum, sulfur and oxygen.
It combines easily with many non-metals, including nitrogen, sulfur , phosphorus, and the halogens.
Oxygen is a particularly strong embrittling agent for molybdenum and tungsten; nitrogen and sulfur are particularly harmful in wrought chromium.
What they have in common are ball-like clusters of flowers of a bright sulfur yellow that fades to a softer orange-yellow as the seeds form.
The first is the ‘bulk’ elements, which include calcium, phosphorus, sulfur , potassium, chlorine, sodium, and magnesium.
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