Use the periodic table to determine the electron configuration for zinc (Zn) and technetium (Tc) in noble- gas notation.

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules