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18. Compare and
contrast the processes of fission and fusion.
22.
A sample of calcium
contains calcium-40, calcium-44, calcium-42, calcium-48, calcium-43, and
calcium-46 atoms. Explain why these atoms can have different mass numbers, but
they must have the same atomic number.
23. Explain what the colors in a fireworks display
reveal about the movement of electrons in atoms.
25.What is the purpose of balancing a chemical
equation?
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