The atomic number of an element is . a. the number of protons in each atom of the element.
b. 1 mol of the element.
c. the number of neutrons in each atom of the element.
d. the mass of the element.

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm