What is the mass of an atom that has 11 protons, 16 neutrons, and 11 electrons? 11 22 27 38

When you turn on a battery-operated device, an electrical circuit is

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2