Lead is heavier and more resistant. Plastic foam is light and can easily be broken
Answer:
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a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Explanation:
The mass would be 28. The mass of an atom equals the number of neutrons and protons added together. In this case, they do not say the protons. But we must use our inside knowledge to know that the number of protons equals the number of electrons. Thus, your number of protons would be 13
Light moves in a straight line except at surfaces between different transparent materials, where its path bends.