How do you determine the number of protons of an element on the periodic table? A. It is the same as the atomic mass
B. It is the same at the atomic number
C. It is not possible to determine from looking at the periodic table
D. Count the number of letters in the element

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

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

Define a is a tiny pavket of energy