What is -0.00000000000000000016 in scientific notation?

Answer 1

-1.6 x 10^-19 [that's ten raised to the -19 power]. To figure it, there are 18 zeros between the decimal point and the first non-zero (the 1). So moving the decimal to the right 19 places will give you -1.6; since you moved it 19 places, the power of ten is -19 {negative power for numbers magnitude less than one, positive powers of ten for numbers magnitudegreater than 10, and 10^0 for numbers magnitude between 1 and 10}