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6. How many electrons can the first electron shell hold?
7. What is the symbol for Sodium?
8. Where is the nucleus in an atom?
- In the neutrons.
- In the middle of an atom.
- In shells around the atom.
- Nuclei aren't in atoms.
9. How do you find out how many neutrons there are in an atom given the atomic number and the mass number?
- Add the mass number and atomic number.
- Take the atomic number away from the mass number.
- Take the mass number away from the atomic number.
- Divide the mass number by the atomic number.
10. Which of these is correct?
- A nucleus has a positive charge.
- Electrons have a positive charge.
- An atom has a positive charge.
- Neutrons have a positive charge.