Answer:
An atom is composed of them
Explanation:
The answer would be D because from my research it's the only one that didn't have a catalyst
The group that magnesium is in has all the elements that are alike to it.
Magnesium is in group 2 which is the alkaline earth metals. So elements similar to it would be calcium, beryllium!
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Answer:
a.the smallest building blocks of matter
Explanation:
because atoms are the smallest building blocks of matter.