Atomic Theory Notes

Multiple Choice

Who was the Greek philosopher that proposed the theory that everything is composed of tiny atoms?

• Democritus

• Aristotle

• Plato

• Socrates

Multiple Choice

What was the main idea of Democritus' theory about matter?

• Matter is made up of earth, fire, air, and water.

• Matter is composed of tiny, indestructible units called atoms.

• Matter is continuous and can be divided infinitely.

• Matter is made up of molecules only.

Multiple Choice

Who created the Modern Theory of Atoms?

• John Dalton

• J.J. Thomson

• Isaac Newton

• Albert Einstein

Multiple Select

Which of the following statements are part of Dalton’s Modern Atomic Theory?

• Atoms of the same element are identical.

• Atoms can be created or destroyed.

• Atoms of different elements have different masses and properties.

• Atoms of different elements can react and bond into chemical compounds.

Multiple Choice

According to the cathode ray tube experiment, why was the beam attracted to the positively charged plate?

• The particles in the beam were negatively charged.

• The particles in the beam were positively charged.

• The particles in the beam were neutral.

• The particles in the beam were heavy.

Multiple Choice

What did Thomson hypothesize about the structure of the atom in his Plum Pudding Model?

• Negative electrons are embedded in a positively charged region.

• Atoms are solid spheres like billiard balls.

• Atoms have a nucleus at the center.

• Electrons orbit the nucleus in fixed paths.

Multiple Choice

What was the main purpose of Rutherford's Gold Foil Experiment?

• To discover electrons

• To test the Thomson model of the atom

• To create gold atoms

• To measure the mass of alpha particles

Multiple Select

Which of the following statements about the results of the Gold Foil Experiment are correct?

• Most alpha particles passed straight through the gold foil.

• All alpha particles were absorbed by the gold foil.

• Some alpha particles were deflected at large angles.

• The experiment showed that atoms have a dense nucleus.

Multiple Choice

Which scientist modified Rutherford's model by explaining the behavior of electrons and theorized that electrons orbit the nucleus along specific paths?

• Niels Bohr

• James Chadwick

• Erwin Schrödinger

• Albert Einstein

Multiple Choice

What are the specific regions for electrons called in the Bohr model of the atom?

• Energy levels

• Electron clouds

• Proton zones

• Neutron shells

Open Ended

How did Erwin Schrödinger's model of the atom differ from the Bohr model regarding the location of electrons?

Open Ended

How did learning about Democritus and his atomic theory change or influence your understanding of the structure of matter?

Multiple Select

Which of the following statements are true about the Electron Cloud Model?

• It updated the electrons of the Bohr model.

• It describes the area where electrons are likely located.

• It was proposed by Erwin Schrödinger.

• It states that electrons orbit the nucleus in fixed paths.