What is the speed of an electron that has the same momentum as a photon with a wavelength in vacuum of 488 nm?.

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Water is important for the of cells. a: size, shape, and temperature b: temperature, color, and odor c: color, odor, and size d: shape, temperature, and color

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change