List Of Chemical Elements - Periodic Table Of Elements With Names

As of December 2015, 118 chemical elements are identified.

List

Notes

• ^1 The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, four such elements, bismuth, thorium, protactinium, and uranium, have characteristic terrestrial isotopic compositions, and thus their standard atomic weights are given.
• ^2 The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
• ^3 The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
• ^4 The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
• ^5 The atomic weight of commercial lithium can vary between 6.939 and 6.996â€"analysis of the specific material is necessary to find a more accurate value.
• ^6 This element does not solidify at a pressure of one atmosphere. The value listed above, 0.95 K, is the temperature at which helium does solidify at a pressure of 25 atmospheres.
• ^7 This element sublimes at one atmosphere of pressure
• ^8 The transuranic elements 95 and above do not occur naturally, but they can all be produced artificially.
• ^9 The value listed is the conventional atomic-weight value suitable for trade and commerce. The actual value may differ depending on the isotopic composition of the sample. Since 2009, IUPAC provides the standard atomic-weight values for these elements using the interval notation. The corresponding standard atomic weights are:
  • Hydrogen: [1.00784, 1.00811]
  • Lithium: [6.938, 6.997]
  • Boron: [10.806, 10.821]
  • Carbon: [12.0096, 12.0116]
  • Nitrogen: [14.00643, 14.00728]
  • Oxygen: [15.99903, 15.99977]
  • Magnesium: [24.304, 24.307]
  • Silicon: [28.084, 28.086]
  • Sulfur: [32.059, 32.076]
  • Chlorine: [35.446, 35.457]
  • Bromine: [79.901, 79.907]
  • Thallium: [204.382, 204.385]
• ^10 C is the standard symbol for heat capacity, and χ is the standard symbol for electronegativity on the Pauling scale.
• ^11 The value has not been precisely measured, usually because of the element's short half-life; the value given in parentheses is a prediction.
• ^12 With error bars: 357+112
  âˆ'108 K.
• ^13 This predicted value is for liquid oganesson, not gaseous oganesson.