middle element in list Algorithm

A chemical component, often simply named an component, is a species of atoms which all have the same number of protons in their atomic nuclei (i.e., the same atomic number, or Z). A popular visualization of all 118 components is the periodic table of the components, a convenient tabular arrangement of the components by their chemical property that uses abbreviated chemical symbols in place of full component names, but the simpler list format exhibited here may also be useful. For more detailed information about the beginnings of component names, see list of chemical component name etymologies.

middle element in list source code, pseudocode and analysis

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