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What is the main idea of Dalton's Atomic Theory?

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Dalton's Atomic Theory states that all matter is made up of atoms, which are indivisible and indestructible particles. Atoms of the same element are identical, and they combine in simple whole-number ratios to form compounds.

Front

Who proposed the first modern atomic theory?

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John Dalton proposed the first modern atomic theory in the early 19th century.

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What did Thomson discover about the atom?

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Thomson discovered the electron, a negatively charged particle, and proposed the 'plum pudding' model of the atom, where electrons are embedded in a positively charged 'soup'.

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What is Rutherford's model of the atom?

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Rutherford's model describes the atom as having a small, dense nucleus that contains protons, with electrons orbiting around it, similar to planets around the sun.

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What is the Electron Cloud Model?

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The Electron Cloud Model describes the atom as having a nucleus surrounded by a cloud of electrons, where the exact position of electrons cannot be determined, only the probability of finding them in certain areas.

Front

What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.

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What did Bohr contribute to atomic theory?

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Bohr proposed that electrons travel in specific orbits around the nucleus and that these orbits correspond to specific energy levels.

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What is the significance of the atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position on the periodic table.

Front

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.