The elements in group 17 of the periodic table are all called halogens. all halogens have the same
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atomic number.
atomic mass.
number of possible isotopes.
number of valence electrons.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

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?