Alpha scattering experiment

Why was the gold leaf important in the alpha scattering experiment?

• Gold can be hammered into incredibly thin sheets.

• Gold has no nucleus.

• Alpha particles can be stopped by air.

Why was the vacuum important in the alpha scattering experiment?

•   Alpha particles are positive.

• Alpha particles can be stopped by air.

• Alpha particles cannot be stopped by air.

4.After the alpha scattering experiment, the scientists concluded that:

most of the atoms must have a very small nucleus, why?

• Some of the particles deflected.

• a).  Only a very small number of particles rebounded completely.

• Some of the particles deflected

After the alpha scattering experiment, the scientists concluded that:

the nucleus must be positively charged, why?

• Some of the particles went straight through.

•  Some particles were deflected.

• Some of the particles rebounded

After the alpha scattering experiment, the scientists concluded that: most of the atom is an empty space , why?

• Some of the particles deflected.

• Some of the particles rebounded

• Most particles went through the atoms in the gold leaf.

5. Describe one reason the nuclear model first developed was different to: The plum pudding model

• The nuclear lacks energy levels.

• The nuclear model included a negative proton.

• The nuclear model included a nucleus.

5. Describe one reason the nuclear model first developed was different to, the nuclear model as we know it today. 

• a)The nuclear model today includes protons, neutrons in energy levels.

• a)The nuclear model today includes protons, neutrons and electrons in energy levels.

• a)The nuclear model today includes neutrons and electrons in energy levels.

Describe Democritus’ beliefs about atoms

• Everything was made of atoms, and

  (particles) which were indivisible (cannot be divided).

• Everything was made of atoms with

   several sub structures

• Everything was made of protons.

Why was the alpha-scattering experiment accepted by scientists?

• Because Three scientist conducted the experiment.

   

• It was not reproducible – other scientists were not able to repeat it and get the same results.

   

• It was reproducible – other scientists were able to repeat it and get the same results.

   

What is the charge of alpha particles?

• positive

• negative

• neutral