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isotope half-life 10 −24 seconds ; hydrogen-5: 86(6) lithium-4: 91(9) hydrogen-4: 139(10) nitrogen-10: 143(36) oxygen-11: 198(12) helium-10: 260(40) hydrogen-6: 294(67) lithium-5
The Earth contains approximately 1.33 × 10 50 atoms. [135] Although small numbers of independent atoms of noble gases exist, such as argon, neon, and helium, 99% of the atmosphere is bound in the form of molecules, including carbon dioxide and diatomic oxygen and nitrogen.
The majority of neutrinos which are detected about the Earth are from nuclear reactions inside the Sun. At the surface of the Earth, the flux is about 65 billion (6.5 × 10 10) solar neutrinos, per second per square centimeter. [14] [15] Neutrinos can be used for tomography of the interior of the Earth. [16] [17]
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
3.78 cm – amount of distance the Moon moves away from Earth each year [113] 4.3 cm – minimum diameter of a golf ball [114] 5 cm – usual diameter of a chicken egg; 5 cm – height of a hummingbird, the smallest-known bird; 5.08 cm – 2 inches, 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube; 6.1 cm – average height of an apple
The current record-holder for a standard 3x3x3 cube is 22-year-old Korean American Max Park, who solved the Rubik’s Cube in 3.13 seconds at a competition in Long Beach, California last year ...
The previous record for the smallest non-avian dinosaur egg, according to Guinness World Records, measures 45-by-20 millimeters (about 1.77-by-0.79 inches). Discovered in Japan's Tamba City, this ...
In 1899, one year before the advent of quantum theory, Max Planck introduced what became later known as the Planck constant. [ 5 ] [ 6 ] At the end of the paper, he proposed the base units that were later named in his honor.