Atomic History Quiz

Which Philosopher theorized that everything was made of tiny indivisible particles, that he called atomos.

• Democritus

• Dalton

• Thomson

• Rutherford

Which of Dalton's postulates is wrong?

• atoms cannot be subdivided, created, or destroyed.

• atoms of different elements combine in simple whole number ratios to form chemical compounds.

• elements are made of small particles called atoms.

• in chemical reactions, atoms are combined, separated, or rearranged.

Which scientist theorized that the atom was a solid and indestructible sphere?

• John Dalton

• JJ Thomson

• Ernest Rutherford

• Niels Bohr

Which scientist performed experiments using Cathode rays to develop an understanding of the atom?

• Democritus

• Thomson

• Bohr

• Dalton

Thomson's experiment concluded that atoms have tiny, negatively charged particles inside them. Which subatomic particle was discovered first and by Thomson?

• proton

• neutron

• electron

• atom

In JJ Thomson's Cathode Ray Tube experiment, he observed that the particles that make up the cathode rays were attracted to a positively charged plate. What conclusion did Thomson draw about the atom based on his observations?

• that atoms are made of mostly empty space

• that electrons move around the nucleus in fixed orbits

• that atoms have negatively charged particles inside them called electrons

• that atoms have a small, dense, positively charged center called the nucleus

Which scientist theorized that atoms are usually neutral with a positive charge in the atom to balance out the electrons. (Plum Pudding model)

• Bohr

• Dalton

• Rutherford

• Thomson

Which subatomic particle did Ernest Rutherford discover?

• Proton

• Neutron

• Electron

• Corpuscle

Which scientist discovered the nucleus after performing the Gold Foil Experiment?

• Rutherford

• Bohr

• Thomson

• Democritus

Which scientist said "at the center of each atom is a very dense, positively charged nucleus"?

• Thomson

• Rutherford

• Dalton

• Bohr