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Hace 1 día · Modern atomic theory is not based on these old concepts. [1] [2] In the early 19th century, the scientist John Dalton noticed that chemical substances seemed to combine with each other by a basic unit of weight, and he decided to use the word atom to refer to these units as he thought they were indivisible in essence.
- 1.67×10−27 to 4.52×10−25 kg
- zero (neutral), or ion charge
Hace 1 día · Niels Henrik David Bohr ( Danish: [ˈne̝ls ˈpoɐ̯ˀ]; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.
Hace 5 días · The Standard Model of particle physics is the theory describing three of the four known fundamental forces ( electromagnetic, weak and strong interactions – excluding gravity) in the universe and classifying all known elementary particles.
Hace 2 días · Atomic theory The Bohr model of the atom, showing states of an electron with energy quantized by the number n. An electron dropping to a lower orbit emits a photon equal to the energy difference between the orbits
- stable ( > 6.6×10²⁸ yr)
- J. J. Thomson (1897)
- e−, β−
- −1 e, −1.602176634×10−19 C
Hace 4 días · The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known.
Hace 5 días · 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 states in an atom are associated with different energy levels, and in transitions between such states they interact with a very specific frequency of electromagnetic radiation.
Hace 4 días · Radiation case (confines thermal X-rays by reflection) A thermonuclear weapon, fusion weapon or hydrogen bomb ( H bomb) is a second-generation nuclear weapon design. Its greater sophistication affords it vastly greater destructive power than first-generation nuclear bombs, a more compact size, a lower mass, or a combination of these benefits.
