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## List of science related numbers Edit

• 92 (ninety-two) is the atomic number of uranium, the heaviest primordial element.
• 94 (ninety-four) is the atomic number of plutonium, which used to be regarded as the heaviest primordial element.
• 108 is the atomic number of the element hassium, which had the systematic symbol Uno.
• The number 126 is a magic number in nuclear physics.
• 128 (one hundred twenty-eight) is the number of protons in both hexamethyltungsten and tungsten hexafluoride, which are gases under standard conditions, the latter being the heaviest known.
• The reciprocal of the fine-structure constant is approximately equal to 137.
• With a leading zero, it is also the German mass traffic telephone number prefix.
• There are exactly 146 primordial nuclides without energetically allowed alpha or beta (including double beta and electron capture) decay modes.
• The isotope dysprosium-164 is the heaviest primordial nuclide without energetically allowed alpha or beta (including double beta and electron capture) decay modes.
• The isotope lead-208 is the heaviest observationally stable nuclide.
• There is also a car with this number in the name.
• The isotope bismuth-209 used to be regarded as the heaviest observationally stable nuclide.
• The isotope uranium-238 is the heaviest primordial nuclide.
• The isotope plutonium-244 used to be regarded as the heaviest primordial nuclide.
• The isotope fermium-257 is the heaviest nuclide that can be formed by neutron capture from naturally occuring elements.
• There are exactly 286 primordial nuclides.
• Since samarium-146 and plutonium-244 used to be regarded as primordial nuclides, some sources list 288 primordial nuclides.
• Tungsten hexafluoride is the heaviest known gas under standard conditions. Using the heaviest primordial nuclides of its elements, its molar mass will be approximately equal to 186 + 6 × 19 = 300. Since it is also equal to 186 + 6 × 13 + 18 × 2, its hexamethyltungsten analogon has the same molar mass.
• The elementary charge is approximately equal to 1.602 × 10−19 coulombs.
• The number 300,000 is used as an approximation for the speed of light, which is equal to 299,792.458 km/s or 299,792,458 m/s.
• On July 10, 1976, the most poisonous chemical substance (namely, 2,3,7,8-Tetrachlorodibenzo-p-dioxin) was the cause of the Seveso disaster. The number of possible isotopical isomers of this substance is (2^20*3^2+2^10*3^2+2^10*3+2^10*3)/4, which amounts to 2,363,136.
• Its prime factorization is 28 × 3 × 17 × 181.
• 299,792,458 is the speed of light in a vacuum, as measured in meters per second. It is usually denoted as $$c$$.
• Its prime factorization is 2 × 7 × 73 × 293,339.
• The number 300,000,000 is used as an approximation for the speed of light, which is equal to 299,792,458 m/s.
• The radiation emitted by the hyperfine transition in the ground state of caesium-133 makes 9,192,631,770 oscillations per second.[1]
• Its prime factorization is 2 × 32 × 5 × 72 × 47 × 44,351.
• The mass–energy equivalence (E=mc2) implies, that a small mass corresponds to a large energy. For instance, a kilogram corresponds to the energy of 89,875,517,873,681,764 joules.

## Approximations in other notations Edit

Approximations of 299,792,458
Notation Approximation
Scientific notation $$2.99792458*10^8$$ (exact)
Arrow notation $$7 \uparrow 10<n<26 \uparrow 6$$
Arrow notation (more precise) $$669 \uparrow 3<n<670 \uparrow 3$$
Arrow notation (more precise) $$17,314 \uparrow 2<n<17,315 \uparrow 2$$
Hyper-E notation $$3E8$$
Factorial $$12!$$
Fast-growing hierarchy $$f_2(27)$$
Hardy hierarchy $$H_{\omega 18}(24)$$
Slow-growing hierarchy $$g_{\omega^8 3}(10)$$
Notation Array Notation $$(10\{1,3\}8)$$

## Sources Edit

1. Definition of Second