1. The problem statement, all variables and given/known data Which of the elements, from the second period, has the highest density in its standard state? 2. Relevant equations Standard state is gas at 1 atm, concentration of 1 M for liquid, or pure substance at 25C and 1 atm. 3. The attempt at a solution I thought that N, O, F, and Ne could be removed from possibilities because they are gases. Then I looked it up and found Boron had the largest density, but that was incorrect.