You mix 245.0 gallons of a mixture containing 4.00 wt% nacl (sodium chloride) and 96.00 wt% water (solution density = 1.0253 g/cm3) with a v2-gallon solution that is 20.00 wt% nacl and 80.00 wt% water (solution density = 1.1453 g/cm3). you want to produce a mixture containing 19.00 wt% nacl. what is v2 in gallons?

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.