6. What is the relative mass of an electron?
- 1/1840
- 1
- 0
- -1
7. What is the "Atomic number" and what symbol is it represented by?
- Z, the number of protons in the nucleus
- A, the number of protons in the nucleus
- Z, the number of protons and neutrons in the nucleus
- A, the number of protons and neutrons in the nucleus
8. Where are electrons located?
- Surrounding the nucleus
- ...
- Inside the nucleus
- Outside the atom
