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There are 41 odd-numbered elements with Z = 1 through 81, of which 30 (including hydrogen, since zero is an even number) have one stable odd-even isotope, the elements technetium (43 Tc) and promethium (61 Pm) have no stable isotopes, and nine elements: chlorine (17 Cl), potassium (19 K), copper (29 Cu), gallium (31 Ga), bromine (35 Br), silver ...
In addition, no odd-numbered element has more than two stable isotopes, while every even-numbered element with stable isotopes, except for helium, beryllium, and carbon, has at least three. Only a single odd-numbered element, potassium, has three primordial isotopes; none have more than three. [citation needed]
Isotopes with equal numbers of protons and neutrons [boxes] are particularly abundant. The elemental basis of the Oddo–Harkins has direct roots in the isotopic compositions of the elements. [7] While even-atomic-numbered elements are more abundant than odd, the spirit of Oddo–Harkins rule extends to the most abundant isotopes as well ...
There are 41 odd-numbered elements with Z = 1 through 81, of which 39 have stable isotopes (technetium (43 Tc) and promethium (61 Pm) have no stable isotopes). Of these 39 odd Z elements, 30 elements (including hydrogen-1 where 0 neutrons is even) have one stable odd-even isotope, and nine elements: chlorine (17 Cl), potassium (19 K), copper ...
Stable even–even nuclides number as many as three isobars for some mass numbers, and up to seven isotopes for some atomic numbers. Conversely, of the 251 known stable nuclides, only five have both an odd number of protons and odd number of neutrons: hydrogen-2 ( deuterium ), lithium-6 , boron-10 , nitrogen-14 , and tantalum-180m .
Monoisotopic elements are characterized, except in one case, by odd numbers of protons (odd Z), and even numbers of neutrons. Because of the energy gain from nuclear pairing, the odd number of protons imparts instability to isotopes of an odd Z , which in heavier elements requires a completely paired set of neutrons to offset this tendency into ...
While most U.S. states hold statewide elections on the first Tuesday of November in even-numbered years, the states of Mississippi, Kentucky, Virginia, New Jersey, and Louisiana have an odd-year ...
The darker more stable isotope region departs from the line of protons (Z) = neutrons (N), as the element number Z becomes larger. Isotopes are nuclides with the same number of protons but differing numbers of neutrons; that is, they have the same atomic number and are therefore the same chemical element. Isotopes neighbor each other vertically.
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