Write the measurement 0.00860 km in scientific notation using the correct amount of significant figures

0.00860 km  in to scientific notation  is   8.60 x10^-3 Km

 Explanation

step for writing scientific notation

move the decimal place  to the right to create  a new number from  1 to 10 for example  0.0086  is   moved three time to create  8.60
Determine the exponent that is the  number  of  time   you  have moved the decimal.   the exponent for 0.00860  is   -3  since  the decimal has been moved toward the  right
Put the number into correct  form  for scientific notation  that is  8.60 x10^-3

Try, How they are formed , the types of elements are involved, and some general properties of the resulting compounds. just as long as it's on the computer.