Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: What do you call the electrons in the outermost energy level of an atom? Answer: valence electrons
[A]: Electrons in the outermost energy level of an atom are called valence electrons. They determine many of the properties of an atom, including how reactive it is.


[Q]: Question: The rock of the mantle is mostly what? Answer: peridotite
[A]: The rock of the mantle is mostly peridotite. Peridotite is formed of crystals of olivine (green) and pyroxene (black).


[Q]: Question: What type of charge do electrons have? Answer: negative
[A]:
Electrons have negative charge and protons have positive charge. The magnitude of the charge is the same for both, .


