Atomic Structure and Radioactivity Quiz

In the Geiger-Marsden experiment, what percentage of alpha particles were scattered back towards the source?

• 0.0125%
• 75%
• 100%
• 50%

What does the Geiger-Marsden experiment reveal about the structure of an atom?

• Atoms are uniformly dense
• Atoms are completely solid
• Atoms have no internal structure
• Atoms are mostly empty space

What is the approximate size of the nucleus compared to the entire atom?

• 1/100
• 1/1,000,000
• 1/10,000
• 1/2

Which particle in an atom has no electrical charge?

• Positron
• Neutron
• Electron
• Proton

What does the atomic number (Z) represent?

• Total number of electrons
• Total number of neutrons
• Mass of the atom
• Number of protons in the nucleus

What defines an isotope?

• Different number of electrons
• Different number of protons
• Different number of neutrons
• Different chemical properties

What happens during ionization?

• Protons change
• Nucleus splits
• Atom gains or loses electrons
• Neutrons multiply

What type of radiation is a helium nucleus?

• Gamma
• X-ray
• Beta
• Alpha

Which radiation type has the highest penetration power?

• X-ray
• Gamma
• Beta
• Alpha

What can stop alpha radiation?

• Thick concrete
• Lead
• Paper
• Steel