Which element has a higher ionization energy? chlorine or bromine

Embryos of different species look very similar, which shows that the organisms share a ancestor.

What is the mass of sodium in 3 moles of sodium chloride

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?