If the atomic number of an element is 6 and its mass number is 4 how many neutrons are contained in the nucleus? a. 14 b. 6 c. 8 d. 20

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.