The answer is <span>D.when the aim is to show electron distributions in shells. This is because there are some instances when elements don't possess a regular or normal electron configuration. There are those who have special electron configurations wherein a lower subshell isn't completely filled before occupying a higher subshell. It is best to visualize such cases using the orbital notation.</span>
Answer:
the answer is B.
Explanation:
The pressure increases... plus i had this same question
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Copper wire is not an example of a pure element because although it's made by pure elements, it's not one itself. It's made by factories.
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