Which outer electron configurations would you expect to belong to a noble gas? a. ns² b. ns²np⁶ c. ns²np⁵ d. ns²np²

(d) For the hydrogen atom, list the following orbitals in order of increasing energy: 3s, 2s, 2p, 5s, 4d.

(b) If we add one electron to form the He atom, would your answer to part (a) change?

Two possible electron configurations for an Li atom are shown here. (c) In the absence of an external magnetic field, can we say that one electron configuration has a lower energy than the other? If so, which one has the lowest energy?

Draw orbital-filling diagrams for atoms with the following atomic numbers. Show each electron as an up or down arrow, and use the abbreviation of the preceding noble gas to represent inner-shell electrons. (a) Z = 25 (b) Z = 56 (c) Z = 28 (d) Z = 47

Write the symbol, give the ground-state electron configuration, and draw an orbital-filling diagram for each of the following atoms. Use the abbreviation of the preceding noble gas to represent the inner-shell electrons. 

(c) The heaviest actinide metal

Write the symbol, give the ground-state electron configuration, and draw an orbital-filling diagram for each of the following atoms. Use the abbreviation of the preceding noble gas to represent the inner-shell electrons. (a) The heaviest alkaline earth metal