I NEED HELP PLEASE ASAP THANK YOU!

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Malia was able to make a paper clip float on the surface of water what will most likely happen to the paper clip if a drop of dishwashing detergent is added near it

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus