What are the electrons in the outermost energy level of an atom called?

1. Electrons sit in energy levels, with the lowest energy nearest the nucleus. 2. Electrons in the outermost energy level of an atom are called valence electrons. 3. All the remaining electrons closer in are the core electrons. 4. Valence electrons matter most because they are the ones that meet other atoms and form bonds. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 4: The atom_