it can be
scientific notation is defined as
(number greater than or equal to 1 and less than 10) times 10^x whre x is the number of places the decimal must be moved to the right to return it to the original value (if it must be moved to the left, make it negative)
if we have
2.3
in sciefitific notation, 0 places must be moved so it would be written as
2.3 x 10⁰
so yes, 0 can be an exponent, tho it would not be helpful and would just be more work
