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Phosphorus, Selenium, Tellurium, and Sulfur
Phosphorus and sulfur are elements 15 and 16 in the periodic chart and selenium and tellurium are in the same group as sulfur. Sulfur was not covered in the previous edition, but sulfur and itsExpand
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Titanium, Zirconium, and Hafnium
Titanium, zirconium, and hafnium belong to the group IVB of the periodic table. A characteristic feature of these transition elements is the ease with which they form stable complex ions. FeaturesExpand
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