instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Microsporophylls bear two to _ microsporangia.
answer:
eight

question:
Optical isomers differ in the arrangement of _ groups around a chiral carbon.
answer:
four

question:
All atoms attempt to achieve the stable configuration of _ electrons in the outer most shell.
answer:
eight