When work is done on an object, the amount of it has changes.

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

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

How are isotopes of the same chemical element alike? how are they different?