Quiz on the Concept of Atom

What did John Dalton use to show that atoms exist?

• Philosophical arguments

• Mathematical equations

• Experimental evidence

• Computer simulations

What did Democritus believe about cutting matter into smaller pieces?

• It could be divided infinitely

• It would eventually reach an uncuttable piece

• It would disappear

• It would change into energy

What did Dalton incorrectly believe about atoms?

• Atoms are made of smaller particles.

• Atoms are tiny solid particles.

• Atoms are liquid particles.

• Atoms are gaseous particles.

What did scientists discover that challenged Dalton's model?

• Atoms are the largest particles.

• Atoms consist of even smaller particles.

• Atoms are made of liquid.

• Atoms cannot form compounds.

In Thomson's plum pudding model, what do the 'plums' represent?

• Protons

• Neutrons

• Electrons

• Photons

What did Thomson believe about the rest of the atom in his model?

• It was neutral

• It was negative

• It was positive

• It was empty

In Rutherford's atomic model, how do electrons move?

• In fixed orbits

• In random orbits around the nucleus

• In a straight line

• Not at all

What does the planetary model of the atom show?

• Electrons are stationary.

• Electrons orbit the nucleus like planets around a star.

• Electrons are inside the nucleus.

• Electrons are randomly scattered.

Who reintroduced the concept of the atom in 1800?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

Which philosopher's atomic theory was essentially correct but had a major flaw?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus