Alom A has an atomic number of 19 and mass number of 40 Atom B has an atomic number of 20 and a mass number of 40 Which of these is an accurate statement?

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?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays