how pure dry sample of the insouble salt barium sulphate could be made from sodium sulphate and barium chloride

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

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.