History Of The Atom

Question 1

In Chemical Reactions, John Dalton Suggested that the Atoms _______________ Themselves and Combined with Other Atoms in New Ways.

Answer 1

Rearranged.

Question 2

At the End or the 1800s, a Scientist Called J.J.Thompson Discovered the _____________. This is a Tiny, Negatively Charged Particle. Thomas was Experimenting by Applying High Voltages to Gases at ______ Pressure.

Answer 2

Electron…Low…

Question 3

Geiger and Marsden Students were Doing an Experiment with ________________ Particles. They were Firing Dense, Positively Charged Particles at the Thinnest Piece of Gold ______ they Could Make.

Answer 3

Radioactive…Foil…

Question 4

Geiger and Marsden Expected Particles to Pass Straight Through the Gold ________ with their Diffuse ________ of Positive Charge. But their Results Shocked Them.

Answer 4

Atoms…Cloud…

Question 5

Geiger and Marsden’s Results were Used to Suggest a New ________ for the Atom. It was Proposed that the Electrons Must be __________ the Nucleus, which Contains Very Dense Positively Charged _________.

Answer 5

Model…Orbiting…Protons…

Question 6

Scientists Discovered that ____________ Must have No Charge and the Same Mass as a Proton.

Answer 6

Neutrons.