instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Six many neutrons do 99% of carbon atoms have.
answer:
How many neutrons do 99% of carbon atoms have?

question:
The core of a star collapses during a supernova, forming a neutron star.
answer:
The core of a star collapses during what event, forming a neutron star?

question:
The ionic end of a detergent can either be a sulfate or sulfonate.
answer:
The ionic end of a detergent can either be a sulfate or what?