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蜂蜜柚子茶什么时候喝~蜂蜜柚子茶什么时候喝治便秘

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答The modern concept of the atom began to take shape in the late 19th century with the work of scientists such as John Dalton, J.J. Thomson, and Ernest Rutherford. John Dalton proposed the atomic theory in 1803, which stated that all matter is made up of tiny, indivisible particles called atoms. He also proposed that atoms of different elements have different masses and combine in simple, whole-number ratios to form compounds.J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays. He proposed the "plum pudding" model of the atom, in which negatively charged electrons are embedded in a positively charged sphere.Ernest Rutherford conducted the famous gold foil experiment in 1911, in which he bombarded a thin sheet of gold with alpha particles. He found that most of the particles passed through the foil, but a small fraction were deflected at large angles. This led him to propose the nuclear model of the atom, in which the atom is mostly empty space with a dense, positively charged nucleus at the center and electrons orbiting around it.In the early 20th century, Niels Bohr expanded on Rutherford's model and proposed that electrons exist in discrete energy levels or shells around the nucleus. This explained the stability of atoms and the emission and absorption of light by atoms.Further advancements in atomic theory came with the discovery of the neutron by James Chadwick in 1932 and the development of quantum mechanics, which provided a mathematical framework for understanding the behavior of atoms and subatomic particles.Today, the atomic theory has been refined and expanded upon, with the discovery of subatomic particles such as quarks and leptons, and the development of the Standard Model of particle physics. The modern understanding of the atom is based on the principles of quantum mechanics and the interactions of subatomic particles.

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