2. what is the relationship between elements and atoms?
3. Explain the arrangement within energy levels of the six electrons of an atom of carbon.
4. How are isotopes of the same element alike?
5. How can we predict which elements are reactive under normal conditions and which are unreactive?
6. Distinguish between covalent and ionic bonds.
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7. Explain why the terms mass and wright should not be used interchangeably.
8. Classify each of the following as an element or a compound: HCI, CO2, CI,LI, and H20.
9. Given that elements are pure substances , how many types of atoms make up the structure of a single element? Explain your answer.