What's the missing mass number and atomic number?

Use the de broglie's wave equation to find the wavelength of an electron moving at 4.5 × 106 m/s. show your work. note: h= plank's constant (6.62607 x 10-34 j s)

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?

All of the following describe uses of nonrenewable energy sources except