The concentration of which component of the atmosphere varies the most?

Which other elements contain the same number of outer electrons as sodium

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

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: