A058317 Number of neutrons in atoms of the n-th element of the periodic table (for the most abundant isotope).
0, 2, 4, 5, 6, 6, 7, 8, 10, 10, 12, 12, 14, 14, 16, 16, 18, 22, 20, 20, 24, 26, 28, 28, 30, 30, 32, 31, 35, 35, 39, 41, 42, 45, 45, 48, 48, 50, 50, 50, 51, 52, 54, 55, 57, 58, 60, 61, 64, 66, 69, 71, 76, 74, 77, 78, 81, 82, 82, 82, 84, 84, 88, 89, 93, 94, 97, 98, 99, 100, 103
Offset: 1
Examples
a(79)=118 because the 79th element is gold, whose only naturally occurring isotope is Au-197, which has 79 protons, 79 electrons and 118 neutrons.
Links
- Y. Bentor, Periodic Table: Neutrons, Chemical Elements.com.
- M. Winter, The periodic table of the elements, WebElements.
Extensions
a(38) updated by Sean A. Irvine, Aug 24 2021