Which object is at the center of the solar system in the geographic model

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Stage in which a typical star has completely stopped fusion