Of the following transitions in the Bohr hydrogen atom, the transition results in the emission of the lowest-energy photon

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Compare and contrast refraction of light and sound will give brainliest