Two elements share very similar chemical properties. you would expect them

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

J. j. thomson’s experiment disproved the theory that an atom

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?