Can someone do this for me cause it’s really not working out for me thank you

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

just did the assignment and the answer was #1 +2 n

fe 55.85 g/mol and h2o 18.02 g/mol.