Question

what was rutherfords (gold foil experiment) most important discovery?
a the periodic table can be organized into groups (columns) and periods (rows)
b electrons have a negative charge and are affected by a magnetic field.
c cathode rays are made of electrons
d atoms have a very small positively charged nucleolus

Explanation:

• Option A: The organization of the periodic table into groups and periods is not related to Rutherford's gold - foil experiment.
• Option B: The discovery that electrons have a negative charge and are affected by a magnetic field was made by J.J. Thomson, not Rutherford.
• Option C: The fact that cathode rays are made of electrons was also discovered by J.J. Thomson.
• Option D: In Rutherford's gold - foil experiment, he shot alpha particles at a thin gold foil. Most alpha particles passed through, but a small number were deflected at large angles. This led him to conclude that atoms have a very small, positively charged nucleus (not nucleolus, but assuming it's a typo for nucleus).

Answer:

D. Atoms have a very small positively charged nucleolus (assuming it's a typo for nucleus)