What is the difference between a linear function and a nonlinear function? Explain what each looks like when
represented as a table and as a graph.

An atom that has fewer electrons that protons is called a positive ion.

B? i think so but hope that's right and answers your question

Answerthe number of protons in an atom is its atomic number

The  moon has  insufficient gravity to retain an  atmosphere. we conclude that the moon has no atmosphere  because its gravitational field is too weak to  have  retained any  atmosphere  that it had over times comparable to the age of the solar system.