10. The gas inside each balloon takes up the same amount of space. The difference in the mass of the balloons is only a few grams at most. The
balloon resting on the table is filled with air. The floating balloon is filled
with helium gas. Why might the helium balloon float while the other rests
on the table?

h let me think

h

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.