So, the short answer is: burning is irreversible because it involves a chemical reaction, while melting is reversible because it's just a phase change.
Eh I can't comment
That's y
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Answer:
elements on the left-hand side of the periodic table such as sodium and magnesium prefer to lose electrons to form a cation because this requires less energy to obtain a stable octet, and vice-versa for the right-hand side of the periodic table e.g. fluorine. However, using this reasoning I am not sure why all transition metals tend to lose electrons rather than gain them.
