a volumetric flask has a volume of 250 ml and weighs 100 g, if it weighs 277 g when filled with pure ether, what is the density of the ether?​

Ineed a picture or something 

13 protons and 14 neutrons.  this also means that the amount of electrons also is 13 because electrons have the same amount as protons..the atomic number means the amount of protons (which effectively tells you the electrons) the atomic mass, tells you the amount of protons and neutrons in the nucleus.hope this .