an isotope or barium (atomic number 56)has an mass of 138.how many neutrons are in the nucleus of this isotope

How are ionic bonds formed and what is the attractive force within an ionic bond

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

What is the mass of phosphorous in a 51-kg person