Garrett, Alfred B. Department of Chemistry, Ohio State University, Columbus, Ohio.
Last reviewed:May 2019
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- Occurrence and classification
- Transuranium elements
- Additional Readings
Atoms with the same atomic number; that is, the same number of protons in their atomic nucleus.. Some common elements are oxygen, hydrogen, iron, copper, gold, silver, nitrogen, chlorine, and uranium (see illustration). Most of the elements are solids at room temperature, two of them (mercury and bromine) are liquids, and the rest are gases.
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