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History of the atom worksheet

Atom worksheet form 2025

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The document is a worksheet on the history of atomic theory, detailing contributions from key scientists: John Dalton, who proposed that all matter is made of indivisible atoms and that compounds form in fixed ratios; J.J. Thompson, who discovered electrons and their negative charge; Ernest Rutherford, who demonstrated that atoms consist of a small positive nucleus and are mostly empty space through his gold foil experiment; and Niels Bohr, who introduced a planetary model of the atom with defined energy levels for electrons.

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What was Rutherford experiment called?

The Geiger\u2013Marsden experiments (also called the Rutherford gold foil experiment) were a landmark series of experiments by which scientists learned that every atom has a nucleus where all of its positive charge and most of its mass is concentrated.

What are the parts of an atom?

We now know that atoms are made up of three particles known as subatomic particles: protons, neutrons and electrons \u2014 which are composed of even smaller particles, such as quarks.

What are atoms mostly made up of?

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

4 1 history of the atom worksheet answer key

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