Grade 11- Chem- 4.2 - atomic structure- week 3

Electrons orbit a certain distance from the nucleus. Either radiate or absorb energy when jumping orbitals.

• 
  Dalton

• Thomson

• Rutherford

• Bohr

Thomson discovered the ____________.

• 
  electrons

• protons

• neutrons

• light

He used Cathode-ray tube experiment and he discovered negatively charged particles within the atom

• Rutherford

• Dalton

• J.J Thomson

• Democritus

The cathode-ray tube experiment helped in the discovery of ________

• 
  Negatively charged particles called electrons

• Positively charged particles called electrons

• Negatively charged particles called Neutrons

• Positively charged particles called protons

According to the figure below, what happens to the ray when a positively charged plate is close to it?

• Continues in a straight path

• Deflects towards the positive plate

• Deflects away from the positive plate

• Deflects away from the positive plate

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

• 
  The nucleus is negatively charged

• The atom is a dense solid and is indivisible

• The mass is conserved when atoms react chemically

• The nucleus is very small and the atom is mostly empty space

What subatomic particle was discovered in the cathode ray tube experiment?

• Proton

• Neutron

• Electron

• Nucleus