How many neutrons are in an atom with atomic number of 53 and mass number of 127?

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable