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History of the atom worksheet

Atom worksheet form 2026

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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 specific ratios; J.J. Thompson, who discovered electrons and their negative charge through cathode rays; Ernest Rutherford, who demonstrated that atoms consist mostly of empty space with a small positive nucleus via the gold foil experiment; and Niels Bohr, who introduced a planetary model of the atom with defined energy levels for electrons.

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Click ‘Get Form’ to open the atom worksheet in the editor.
Begin by entering your name, date, and class in the designated fields at the top of the form. This information is essential for identifying your submission.
Proceed to the section on John Dalton. Read through his atomic theory and answer questions 1 to 5 based on your understanding. Use the text provided as a reference.
Move on to J.J. Thompson's section. Carefully review his discoveries and fill in answers for questions 1 to 5, ensuring you capture key concepts about electrons and cathode rays.
Continue to Lord Ernest Rutherford’s segment. Reflect on his gold foil experiment and complete questions 1 to 5, focusing on the implications of his findings regarding atomic structure.
Finally, address Niels Bohr's model of the atom. Answer questions 1 to 5, considering how energy levels affect electron behavior within an atom.

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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.

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