technetium is the only element lighter than uranium that does not occur naturally. it is produced by neutron activation of molybdenum. fill in the correct isotopes to show how this process works.

On a distance vs time graph the line of an object at rest is a

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

What is the measured amount of a product obtained from a chemical reaction?