Answer:
A. Element
Explanation:
Iron (Fe), chemical element and one of the transition elements, the most-used and cheapest metal.
The number of electrons. The valence (outer) shell is particularly important.
You forgot one...and that happens to be the answer---> Accuracy
A geologist will ask an analytical chemist to help identify the minerals in a rock because an analytical chemist studies the composition of matter and, therefore, can identify the minerals.
The analytical chemist does this by determining the crystal structure as a matter of routine using X-ray and electron diffraction techniques.
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