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Oddo–Harkins rule
The Oddo–Harkins rule holds that elements with an even atomic number (such as carbon) are more common than elements with an odd atomic number (such as nitrogen). This effect on the abundance of the chemical elements was first reported by Giuseppe Oddo in 1914 and William Draper Harkins in 1917.
==Definition==
All atoms bigger than hydrogen are made in stars when gravity, heat and pressure cooperate to persuade protons and neutrons to clump together in a process called nuclear fusion or in the process of a supernova. Later, after the clumps have had a chance to cool off and accumulate electrons for their shells, each is the nucleus of a new atom. The number of protons that the nucleus ends up with is the atomic number, and that is also the normal number of electrons around it, making the atom electrically neutral. The number of neutrons in an atom varies.
This rule argues that elements with odd atomic numbers have one unpaired proton and are more likely to capture another, thus increasing their atomic number. In elements with even atomic numbers, protons are paired, with each member of the pair offsetting the spin of the other, enhancing stability.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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