1. Atoms are made of three fundamental particles: ______, ______, and _______.
2. Protons have a _______ charge.
3. Neutrons have a _______ charge.
4. Electrons have a _______ charge.
5. Which Greek philosophers devised the earliest theories about atoms?
6. Who was the first modern scientist to propose an atomic theory?
7. Which scientists contributed to our current model of the atom and its subatomic particles?
8. Describe the nuclear force.
9. Differentiate between atomic number and atomic mass.
10. Describe three isotopes of hydrogen.
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