A sample is described by the following observations: It is…

A sаmple is described by the fоllоwing оbservаtions: It is а pure substance. It cannot be separated by physical means. Every atom in the sample contains 17 protons. Mass spectrometry reveals atoms with 18 neutrons and atoms with 20 neutrons. When the sample gains one electron per atom, it forms a stable ion. Which statement is most accurate?