Elements are separate particles that contain the properties of only one type of element (pure substance) and an atom represents that element as the smallest non divisible particle that retains the properties of that element. Compounds can be formed by conjoining different atoms together in different ratios and shapes, so a combination of elements.
Magnesium is the correct answer
The answer is A how it react with other chemicals
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It may be unreliable because it might mess something up from the speed.
