Answer:
Neutral atoms of each element contain an equal number of protons and electrons. The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.
Explanation:
A reaction in which oxidation numbers change is the answer! :D
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the second one, any change in a DNA gene or chromosome
Answer:
b. bread turns brown in the toaster
