Actual Resources: are those which have been surveyed, their quantity and quality determined and are being used in present times.
Potential Resources: <span>They can exist in a region and can be used in the future.</span>
Answer:
D. The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
Metals, metalloids, non-metals
Explanation:
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