The rule that says electrons are added to the lowest energy level first.
Mixtures are made up of 2 or more pure substances. pure substance is just its self and a mixture is multiple substances.
Answer:
Do you have a picture
or can you state the reaction
Answer:
E. Thomson
Explanation:
J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.
https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus
