Option d: copper.
Because copper is an element, not a mixture.
Heat is energy, and that energy would eventually cause the object to undergo a phase change.
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Answer:
11 electrons total and 23amu
Explanation:
This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu.
