Calculate: a. The most likely radius of an electron in the 1s orbital of a hydrogen atom b. The radius that encompasses an 80% probability of finding the electron in a 1s orbital of a hydrogen atom.

О Which of the statements most accurately describes the following electron configuration? 1 ↓ 1 a. It is a valid configuration for a ground state atom. b. It violates the aufbau principle. c. It is invalid and violates multiple rules/principles. d. It violates the Pauli exclusion principle. e. It violates Hund's rule.

; Draw two of the orbitals for an electron with n=5 and 1=2, and one of the orbital with n=3 and l=1 label them correctly (provide the names of the orbitals). *** y y y X

49. Which of the following correctly identifies how Louis de Broglie's concept of the electron as a particle-wave helped to explain energy levels for an electron in an atom. A. de Broglie described the electron orbit as a circular standing wave pattern with a specific angular momentum as required by the Bohr hypothesis. B. de Broglie described the electron as a planar wave with a non- specific frequency as required by the Bohr hypothesis. C. de Broglie described the electron as a wave whose range of frequencies was continuous and thus allowed for all the possible electron energies predicted by Bohr. D. de Broglie described the electron as a spherical wave whose wavelength was dependent upon the speed with which it orbits the nucleus, as needed to explain the Bohr hypothesis.