The of an element is the weighted average of the masses of the isotopes of that element

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

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

Na chemical reaction, activation energy increases the of the reactants. this outcome causes the particles to collide, which results in the of new products.