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Atomic Mass Discrepancy Quiz

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Questions and Answers

What did Rutherford predict as the reason for the discrepancy between the actual atomic mass and the calculated atomic mass?

Extra neutrons around the nucleus

Unidentified particles outside the nucleus

Presence of electrons inside the nucleus

Presence of neutral particles inside the nucleus (correct)

What is the composition of an alpha particle used by Rutherford in his famous experiment?

One proton and two neutrons

Two protons and two neutrons (correct)

Two protons and one neutron

One proton and one neutron

What was the primary aim of Rutherford's experiment with alpha particles and gold foil?

To determine the mass of electrons in the atom

To investigate the scattering behavior of alpha particles (correct)

To detect the presence of photons in the nucleus

To measure the atomic mass of gold atoms

Why was Thomson's model of the atom considered incorrect by Ernest Rutherford?

It incorrectly represented the electron as being inside the nucleus (D) Signup and view all the answers

How did the experimental results from Rutherford's alpha particle scattering experiment impact the understanding of atomic structure?

Led to the discovery of new subatomic particles (C) Signup and view all the answers

Why was gold chosen for Rutherford's experiment with α-particles?

Because gold could be easily hammered into thin sheets (C) Signup and view all the answers

According to Rutherford's experiment, what did the deflection of α-particles at large angles suggest about the atom?

That both mass and positive charge are concentrated in a tiny volume (A) Signup and view all the answers

How did Rutherford explain the stability of the nucleus against repulsion among protons?

By proposing the presence of neutral particles called neutrons (C) Signup and view all the answers

What role do strong nuclear forces play in holding protons and neutrons together?

Balancing the electrostatic repulsion between protons (A) Signup and view all the answers

How did Rutherford explain why electrons in an atom do not fall into the nucleus?

Due to the equal and opposite forces of attraction and repulsion they experience (C) Signup and view all the answers