It makes calculations with very large and small numbers easier.
Scientific notation is a system used in order to It makes calculations with very large and small numbers easier. It is useful as it allows very large number that would take a lot of space to write otherwise, and it allows them to be calculated easier. 
for example is a incredible large number, but written in this form is immediately understandable and useful for calculation.
In 2Cr2O7 there’s 2 items; Cr and O
Answer:
Positive ions, or cations.
Answer:
B-flood
Explanation:
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