Structure of the Atom

What is the fundamental building block of matter?

• Molecules

• Elements

• Atoms

• Particles

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Why did scientists at the end of the 19th century need to reveal the structure of the atom?

• To develop new technologies

• To understand the properties of electricity

• To explain the nature of charged particles

• To create a new chemical element

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Who discovered the presence of positively charged canal rays?

• J.J. Thomson

• E. Goldstein

• Ernest Rutherford

• Dalton

What sub-atomic particle did E. Goldstein discover?

• Electron
• Neutron
• Proton
• Photon

What is the charge of a proton?

• Positive
• Negative
• Neutral
• Variable

According to Thomson's model of an atom, where are electrons embedded?

• In the nucleus
• In positively charged sphere
• In the electron cloud
• Inside protons

What was the major drawback of Thomson's model of an atom?

• It didn't explain electrical neutrality
• It failed to account for the presence of electrons
• It didn't consider protons
• It didn't explain the nature of charged particles

Who conducted the famous alpha-particle scattering experiment?

• J.J. Thomson
• E. Goldstein
• Ernest Rutherford
• Dalton

What was the unexpected result of Rutherford's alpha-particle scattering experiment?

• Most particles were deflected by 180°
• Most particles passed straight through the foil
• All particles rebounded
• Most particles were absorbed by the foil

According to Rutherford's nuclear model, where is the majority of an atom's mass located?

• In the electrons
• In the positively charged sphere
• In the nucleus
• In the neutron cloud