Final answer:
The exponent used for the scientific notation of 0.0000201 is -5.
Step-by-step explanation:
Scientific notation represents a number as the product of a coefficient and a power of 10. For example, the number
0.0000201 can be expressed in scientific notation as 2.01×10 ^−5.
The exponent in scientific notation represents the power to which the base (usually 10) is raised. In this case, the exponent is −5 because the original number is multiplied by 10 raised to the power of −5 to represent the magnitude of the given decimal number in a more compact form. Therefore, the exponent used for the scientific notation of the number 0.0000201 is −5.