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On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. The bombings killed between 129...

from relatively small amounts of matter. The first test of a fission ("atomic") bomb released an amount of energy approximately equal to 20,000 tons of...

Alamos Laboratory during World War II and is often called the "father of the atomic bomb". Born in New York City, Oppenheimer earned a bachelor of arts degree...

across the US, the UK, and Canada. The project resulted in two types of atomic bombs, developed concurrently during the war: a relatively simple gun-type...

law, which states that when the elements are arranged in order of their atomic numbers an approximate recurrence of their properties is evident. The table...

lowest mass) has an atomic weight of 1.007825 Da. The value of this number is called the atomic mass. A given atom has an atomic mass approximately equal...

the nuclei of their atoms, known as the element's atomic number. For example, oxygen has an atomic number of 8, meaning that each oxygen atom has 8 protons...

of isotopes. Most commonly, the molar mass is computed from the standard atomic weights and is thus a terrestrial average and a function of the relative...

The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of...

Oppenheimer's atomic bomb explosion". Entertainment Weekly. Retrieved December 6, 2023. Alperovitz, Gar (1996). The Decision to Use the Atomic Bomb. New York:...

York Geneva Seibersdorf Monaco Toronto Tokyo Trieste The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to...

dismantled, not destroyed. It is also noteworthy that since the dawn of the Atomic Age, the delivery methods of most states with nuclear weapons have evolved—with...

structure and electronic structure of matter to be investigated at the atomic, molecular and macro scale, and over astronomical distances. Historically...

The dalton or unified atomic mass unit (symbols: Da or u) is a non-SI unit of mass defined as 1/12 of the mass of an unbound neutral atom of carbon-12...

the atomic bombings of Hiroshima and Nagasaki. The United States conducted six atomic tests before the Soviet Union developed their first atomic bomb...

of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). The definitive visualisation of all 118...

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based...

two down quarks and one up quark. These commonly bind together into an atomic nucleus, e.g. a helium-4 nucleus is composed of two protons and two neutrons...

An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron...

In quantum mechanics, an atomic orbital (/ˈɔːrbɪtəl/) is a function describing the location and wave-like behavior of an electron in an atom. This function...