Can Someone help me with the formula

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

Which statement best explains the relationship between an area is geography and the temperature of its surface water

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon