Chemistry question please help!!

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

What is the maximum number of electrons that an atomic orbital can contain?

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?