The atomic number of magnesium is 12. this means that its nucleus must contain a) 6 protons and 6 neutrons. b) 6 neutrons and 6 electrons. c) 12 neutrons and no protons. d) 12 protons and no electrons.

Atomic nuclei of almost all elements consist of

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o