Atomic Theory

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What is Atomic Theory?

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Atomic Theory is a scientific theory that states that matter is composed of discrete units called atoms. It explains the nature and behavior of atoms and how they combine to form molecules.

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Who proposed the Atomos Theory?

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Democritus proposed the Atomos Theory, which suggested that everything is made up of small, indivisible particles called atoms.

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What did John Dalton contribute to Atomic Theory?

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John Dalton formulated the first modern atomic theory, which included the idea that atoms of a given element are identical in mass and properties, and that compounds are formed by the combination of different types of atoms.

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What did J.J. Thomson discover?

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J.J. Thomson discovered the electron through his experiments with cathode rays, demonstrating that atoms are not indivisible.

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What is the significance of Rutherford's gold foil experiment?

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Rutherford's gold foil experiment led to the discovery of the atomic nucleus, showing that atoms have a small, dense center (nucleus) surrounded by mostly empty space.

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How did Niels Bohr describe the atom?

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Niels Bohr described the atom as having electrons orbiting the nucleus in fixed paths, similar to planets orbiting the sun, which is known as the planetary model of the atom.

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What is the main idea of the quantum mechanical model of the atom?

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The quantum mechanical model of the atom describes electrons as existing in probabilistic clouds around the nucleus, rather than in fixed orbits.

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What is the difference between an atom and a molecule?

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An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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What are isotopes?

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Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

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What is the role of protons in an atom?

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Protons are positively charged particles found in the nucleus of an atom and determine the atomic number and identity of the element.