0.517 = what’s this in scientific notation

Which statement describes james chadwick’s discovery.

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?