HW: The History of the Atom

The Greek philosopher who first spoke about the idea of an atom was:

• Plato

• Democritus

• Aristotle

• Socrates

Thomson’s experimentation with the ________________ helped lead to his discovery of the corpuscle (electron).

• cathode ray tube

• mass spectrometer

• oil drop apparatus

• gold foil

Which of the following lists correctly states Dalton’s Four Postulates that contributed to atomic theory?

• All matter is made of atoms; Atoms are indivisible and indestructible; All atoms of a given element are identical; Atoms combine in simple whole-number ratios to form compounds.

• Atoms are made of protons, neutrons, and electrons; Atoms can be divided; Atoms of the same element have different masses; Atoms combine in any ratio.

• All matter is made of molecules; Molecules are indivisible; All molecules of a given element are identical; Molecules combine in complex ratios.

• Atoms are made of energy; Atoms are always visible; Atoms of different elements are identical; Atoms do not combine.

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NGSS.HS-PS1-7

The scientist best known for his “Plum Pudding” model of the atom is:

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• John Dalton

The scientist who discovered the electron is:

• J.J. Thomson

• Isaac Newton

• Albert Einstein

• Niels Bohr

The scientist who discovered the nucleus is:

• Ernest Rutherford

• Isaac Newton

• Niels Bohr

• James Chadwick

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NGSS.HS-PS1-8

The scientist who proposed the “Planetary Model” of an atom where the electrons orbit around the nucleus is:

• Niels Bohr

• Ernest Rutherford

• J.J. Thomson

• James Chadwick

The scientist who described electrons as waves that move in orbitals is:

• Niels Bohr

• Erwin Schrödinger

• James Chadwick

• J.J. Thomson

Tags

NGSS.HS-PS4-3

The scientist who discovered the neutron is:

• James Chadwick

• Ernest Rutherford

• Niels Bohr

• Marie Curie

Which scientist’s model described atoms as tiny, solid spheres that could not be broken down into smaller parts (could not be divided)?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr