periodic element (a pure chemical substance consisting a single type of atom, distinguished by the number of protons in the atoms' nucleii)
transition metal (an element contained within Group 3 to 12 of the periodic table)
metallic element (is an element that readily loses electrons to form positive ions and has metallic bonds between metal atoms)
single-molecule substance (a substance that consists of only one type of molecule, such as the periodic elements or water)
mineral (a naturally occurring substance formed through geological processes that has a characteristic chemical composition)
chemical compound (a substance consisting of two or more different elements chemically bonded together in a fixed proportion by mass)
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