ACS Domain 1: Atomic structure Welcome to your ACS Domain 1: Atomic structure 1. ACS: Atomic structure Which electronic transition in a hydrogen atom emits the highest energy photon? n = 2 to n = 1 n = 3 to n = 2 n = 5 to n = 2 n = 4 to n = 3 None 2. ACS: Atomic structure What is the maximum number of electrons that can occupy a single orbital? 1 2 3 4 None 3. ACS: Atomic structure In a multielectron atom, which electron transition corresponds to the absorption of the lowest energy photon? From 1s to 2s From 2s to 2p From 2p to 3d From 3s to 4p None 4. ACS: Atomic structure What is the electron configuration for a Ca^2+ ion? [Ar]4s^2 [Ar] [Ne]3s^2 3p^6 [Ar]3d^2 None 5. ACS: Atomic structure Which statement about isotopes is correct? Isotopes of an element have different numbers of protons. Isotopes of an element have different numbers of electrons. Isotopes of an element have different numbers of neutrons. Isotopes of an element have different electron configurations. None 6. ACS: Atomic structure Which quantum number determines the shape of an electron orbital? Principal quantum number (n) Azimuthal quantum number (l) Magnetic quantum number (m_l) Spin quantum number (s) None 7. ACS: Atomic structure The Aufbau principle states that: Electrons occupy the highest energy orbitals first. Electrons pair up in an orbital only after all orbitals in the same sublevel have one electron. Electrons fill the orbitals of lowest energy first. Electrons in the same orbital must have the same spin. None 8. ACS: Atomic structure What is the total number of orbitals in the third energy level (n=3) of an atom? 3 5 9 7 None 9. ACS: Atomic structure Which electron configuration is possible for an atom in an excited state? 1s^2 2s^2 2p^6 1s^2 2s^2 2p^5 3s^1 1s^2 2s^2 2p^6 3s^2 1s^2 2s^2 2p^6 3p^1 None 10. ACS: Atomic structure Which is the correct electron configuration for the outer shell of a bromine atom in the ground state? 4s^2 4p^5 4s^2 4p^6 3s^2 3p^5 4s^2 3d^10 4p^5 None 1 out of 10 Time is Up! Time's up
