Grade 11 Atomic Models Worksheet

Grade 11 Atomic Models Worksheet

Read each question carefully and answer to the best of your knowledge. Show all your work for calculations.

1. Which atomic model proposed that electrons orbit the nucleus in specific energy levels or shells?

2. The discovery of the electron led to the proposal of which atomic model?

1. In Rutherford's gold foil experiment, most alpha particles passed straight through, indicating that the atom is mostly  .

2. The Heisenberg Uncertainty Principle states that it is impossible to precisely know both the   and   of an electron at the same time.

3. The quantum mechanical model describes the probability of finding an electron in a certain region of space called an  .

1. Dalton's atomic theory proposed that atoms of the same element are identical in mass and properties.

2. The Bohr model successfully explained the spectra of multi-electron atoms.

1. Briefly describe the main contribution of J.J. Thomson to the development of atomic models.

2. Explain why the Rutherford model was considered an improvement over the Thomson model, but also had limitations.

Match each scientist with their primary contribution to atomic theory.

The quantum mechanical model of the atom describes the wave-like properties of electrons and their probable locations. Unlike the Bohr model, it does not define a precise orbit for electrons.

Consider a hydrogen atom. Sketch a representation of the 1s and 2p orbitals, showing the general shape and relative size of each.