Ions that are surrounded by layers of solvent are said to be

The solvation is the state of being surrounded by several layers of ordered solvent molecules. Hydration is salvation by water. In addition, hydration is the molecule state of being surrounded by and interacting with several layers of solvent water molecules in which solvated by water. The water of hydration is the shell of relatively immobile water molecules that surrounds and interacts with solvates a dissolved molecule.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.