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Democritus was born in 460 bc -
He concluded that divisibility of matter comes to an end, and the smallest possible fragments must be bodies with sizes and shapes, although the exact argument for this conclusion of his is not known. The smallest and indivisible bodies he called "atoms."[3] Atoms, Democritus believed, are too small to be detected by the senses; they are infinite in numbers and come in infinitely many varieties, and they have existed forever and that these atoms are in constant motion in the void or vacuum. -
Visigoths from Eastern Europe ended a three-day sack of the city of Rome, which is now the capital of Italy -
Democritus died in 370 bc
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Michael Faraday was born -
The French Revolutionary Wars officially ended in 1802 with the signing of the Treaty of Amiens, temporarily establishing peace between France and the other European powers. -
John Dalton's marble model of the atom envisioned atoms as solid, indivisible spheres, each representing different elements with distinct properties. -
Michael Faraday's key discoveries related to electromagnetism and electrochemistry occurred primarily between the 1830s and 1850s, with electromagnetic induction being demonstrated in 1831 and his formulation of the laws of electrolysis published in 1834.
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One of the most major events between 1840 and 1860 was the Revolutions of 1848, which swept across Europe, leading to widespread demands for political reform, national independence, and social change. This series of uprisings significantly impacted the political landscape of many countries, though most were ultimately suppressed. -
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J. J. Thomson was born -
Michael Faraday died -
Robert Andrews Millikan was born -
Ernest Rutherford was born -
Niels Bohr was born -
first olympics are heald -
Eugen Goldstein, in the late 19th century, conducted experiments that led to the discovery of canal rays, or positive rays, in 1886, which provided evidence for the existence of positively charged particles in atoms. His work contributed significantly to the understanding of atomic structure, paving the way for the identification of protons as fundamental components of atoms. -
Erwin schrodinger was born -
James Chadwick was born -
werner heisenberg was born -
In 1903, the Wright brothers achieved the first powered flight at Kitty Hawk, North Carolina, marking a pivotal moment in the history of aviation and paving the way for the future of air travel. -
The plum pudding model, proposed by J.J. Thomson in 1904, suggested that atoms were composed of a positively charged "soup" with negatively charged electrons embedded like "plums" within it. This model advanced the understanding of atomic structure by introducing the concept of subatomic particles, challenging the idea of atoms as indivisible units and laying the groundwork for later developments in atomic theory, particularly the discovery of the nucleus. -
The nuclear model of the atom, proposed by Ernest Rutherford in 1911, describes the atom as having a dense nucleus surrounded by orbiting electrons, fundamentally changing the understanding of atomic structure. -
In 1909, Robert Millikan conducted the oil drop experiment, which precisely measured the charge of the electron. This groundbreaking discovery provided key evidence for the quantization of electric charge and was critical in confirming the existence of discrete elementary charges. -
Niels Bohr's solar system model of the atom, proposed in 1913, depicted electrons orbiting the nucleus in fixed paths, similar to planets revolving around the sun, while also introducing the idea of quantized energy levels. This model advanced atomic theory by explaining how electrons can occupy specific energy levels without radiating energy, thus laying the groundwork for modern quantum mechanics. -
The Armistice of November 11, 1918, marked the end of World War I, leading to a significant realignment of national boundaries and the signing of the Treaty of Versailles in 1919, which sought to establish lasting peace but also sowed the seeds for future conflicts. -
In 1926, Erwin Schrödinger developed the wave equation, which led to the concept of electron cloud models for atoms, replacing the earlier Bohr orbits with regions of probability where electrons are likely to be found. This quantum mechanical model advanced the understanding of atomic structure by emphasizing the wave-like behavior of electrons and introducing the idea of orbital clouds rather than fixed paths. -
In 1925, Werner Heisenberg formulated the matrix mechanics version of quantum mechanics, which provided a new mathematical framework for understanding atomic behavior. His Heisenberg Uncertainty Principle (1927) further advanced atomic theory by demonstrating that the precise position and momentum of an electron cannot be simultaneously known, challenging classical notions of determinism and solidifying the wave-particle duality of atoms. -
The Great Depression, which began with the U.S. stock market crash in 1929, led to widespread economic hardship, high unemployment, and global financial instability that lasted throughout the 1930s. -
Eugen Goldstein died -
In 1932, James Chadwick discovered the neutron, a neutral subatomic particle within the atomic nucleus, which helped explain atomic mass discrepancies that couldn't be accounted for by protons alone. This discovery advanced atomic theory by refining the understanding of atomic structure and leading to the development of nuclear models that integrated protons, neutrons, and electrons, further solidifying the concept of the atomic nucleus. -
Ernest Rutherford died on -
J. J. Thomson died -
The attack on Pearl Harbor occurred on December 7, 1941, when the Japanese Imperial Navy launched a surprise aerial assault on the U.S. naval base in Hawaii, killing over 2,400 Americans and sinking or damaging numerous ships. This attack led to the United States' formal entry into World War II, with Congress declaring war on Japan the following day. -
Robert Andrews Millikan death occured -
Erwin schrodinger died -
Niels Bohr had died -
James Chadwick died -
werner heisenberg died -
The Jimmy Neutron model, inspired by the animated character from the early 2000s, presents a whimsical and simplified view of atoms, often depicting them as playful, animated particles to engage a younger audience in scientific concepts.