suppose now that you wanted to determine the density of a small crystal to confirm that it is phosphorus. from the literature, you know that phosphorus has a density of 1.82 . how would you prepare 20.0 ml of the liquid mixture having that density from pure samples of ( = 1.492 g/ml) and ( = 2.890 g/ml)? (note: 1 ml = 1 .)

i think   the answer is c hope i'm right

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.