Atomic Theory

Who was considered as one of the founders of the ancient atomist theory?

• Aristotle

• Parmenides

• Empedocles

• Democritus

All of the following are true about Democritus' atomic theory EXCEPT ______.

• Everything is made up of atomos and the void.

• Atoms vary in size and shape.

• Atoms are composed of subatomic particles.

• Atoms are infinite in number.

Which scientist is known for his, "Plum Pudding" model of an atom?

• JJ Thomson

• John Dalton

• Ernest Rutherford

• Erwin Schrodinger

Which of the following is TRUE about Dalton's atomic theory?

• Each element contains a set of protons, neutrons, and electrons.

• All atoms, regardless of whatever element, are identical.

• Atoms can be created and destroyed.

• Each element is composed of extremely small particles called, "atoms".

How did Rutherford discovered the proton?

• through the cathode-ray experiment

• through the Gold-foil experiment

• through studying the wave property of an electron

• through injecting gamma rays in an atom

Rutherford's experiment provided evidence that ___________.

• negative and positive charges are spread evenly throughout the atom

• Gold is not as dense as previously thought.

• Alpha particles have a positive charge.

• There is a dense, positively-charged nucleus at the center of the atom.

Who gave the idea that the atom is mostly made up of empty space?

• Ernest Rutherford

• JJ Thomson

• Erwin Schrodinger

• Neils Bohr

Which scientist proposed the model of the atom in which the electrons are orbiting at different levels?

• Ernest Rutherford

• JJ Thomson

• Erwin Schrodinger

• Neils Bohr

What will happen when an electron jumps from a higher energy level to a lower energy level?

• Nothing will happen.

• Energy is absorbed.

• Energy is emitted in the form of light.

• The electron will leave the ground state.

Which among the following is TRUE about Schrodinger's atomic theory?

• Energy is concentrated on the electrons.

• Electrons can act as particles and waves.

• The electrons' location can be determined by merely looking at it.

• Electrons are infinite in number.