Why does split petrol form a stick on top of water?

0.09 moles of sodium sulfate in 12 ml of solution

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

What will most likely happen when two bromine atoms bond together?