Questions: By observing the scattering of alpha particles from gold foil, Rutherford determined that atoms have: a dense positively charged core. positive charges distributed approximately evenly throughout the atom. wave-like particles of very small dimensions. different isotopes having different masses. none of these. Question 5 (1 point) How many protons, neutrons, and electrons are in a silver atom with a mass number of 108 ? 13 61 protons, 108 neutrons, 61 electrons 47 protons, 108 neutrons, 47 electrons 61 protons, 47 neutrons, 47 electrons 47 protons, 61 neutrons, 47 electrons 47 protons, 47 neutrons 61 electrons

Solution Steps

Rutherford's gold foil experiment led to the discovery that atoms have a dense, positively charged core, which he called the nucleus. This was determined by observing that a small fraction of alpha particles were deflected at large angles when they passed through the gold foil.

• A dense positively charged core: This matches Rutherford's findings.
• Positive charges distributed approximately evenly throughout the atom: This was the earlier "plum pudding" model, which Rutherford disproved.
• Wave-like particles of very small dimensions: This is related to quantum mechanics, not Rutherford's findings.
• Different isotopes having different masses: This is true but not related to Rutherford's gold foil experiment.
• None of these: Incorrect, as the first option is correct.

The correct answer is that Rutherford determined atoms have a dense positively charged core.

\(\boxed{\text{a dense positively charged core}}\)

A silver atom with a mass number of 108 has:

• Atomic number (number of protons) = 47 (since silver's atomic number is 47)
• Number of neutrons = Mass number - Atomic number = 108 - 47 = 61
• Number of electrons = Number of protons (since the atom is neutral) = 47

• 61 protons, 108 neutrons, 61 electrons: Incorrect, as the number of protons should be 47.
• 47 protons, 108 neutrons, 47 electrons: Incorrect, as the number of neutrons should be 61.
• 61 protons, 47 neutrons, 47 electrons: Incorrect, as the number of protons should be 47.
• 47 protons, 61 neutrons, 47 electrons: Correct.
• 47 protons, 47 neutrons, 61 electrons: Incorrect, as the number of neutrons should be 61.

The correct answer is 47 protons, 61 neutrons, 47 electrons.

\(\boxed{\text{47 protons, 61 neutrons, 47 electrons}}\)

Final Answer