Examlex
This structure in the heart initiates action potentials that stimulate contraction of the heart at constant rate of about 100 beats per minute.
Scandium
A rare, light, silvery-metallic element used in some aerospace applications.
Halogens
A group of highly reactive elements located in Group 17 of the periodic table, which include fluorine, chlorine, bromine, iodine, and astatine.
Atomic Symbol
A one- or two-letter notation used to represent an element, based on its Latin name.
Copper
A red-orange metallic element that is ductile and conductive, used extensively in electrical wiring and plumbing.
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