HELP I'll Mark as brainliest!

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

An atom that has gained or lost electrons is called an _

Mixing salt in water is an example of physical change