In Bohr's theory for the lowest state of the hydrogen atom, an electron with a mass of 9.11 x 10^-31 kg would move with a velocity of 2.188 x 10^6 m/s. What is the de Broglie wavelength (in m) of such an electron?

a. Based on Aufbau filling principles, chromium would be expected to have the following configuration [Ar]4s^23d^4. but the configuration is actually [Ar] 4s^13d^5. Wrtie a brief statement explaining why this alternate configuration is the known configuration for chromium.

b. What other elements would be expected to have a similar configuration?

Copper also "violates" the Aufbau filling principle. Write the electron configuration expected for copper and propose another configuration based on your answer to question 2 above. Write a brief justification for your alternate electron configuration.