Question

which piece of the atomic theory was added by rutherford’s gold foil experiment?
atoms contain negatively charged electrons.
the electrons in an atom orbit the nucleus in energy levels.
atoms are made of a dense nucleus surrounded by electrons.
matter is made of atoms that can be categorized as different elements.

Explanation:

• Rutherford's gold foil experiment showed most alpha particles passed through (empty space), some deflected (dense, positive nucleus). So it proved atoms have a dense nucleus with electrons around.
• First option: Discovered by Thomson (cathode ray).
• Second: Bohr's model.
• Fourth: Dalton's theory.

Answer:

Atoms are made of a dense nucleus surrounded by electrons.