The science of molecules and and their is called chemistry

What is common about these molecules? a. their atoms are held together by covalent bonds. b. they are all made up of the same two atoms. c. their atoms are held together by ionic bonds. d. they are all made up of oxygen atoms only.

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

Find the mass, in grams, of 5.00*10^23 molecules of f2