What is the difference between an oxygen atom and an oxygen ion?

Compare and contrast the bohr model and the electron cloud models of the atom.

How have the greenhouse gasses increased from the year 2000 to 2018

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands