How many mL of water would I need to add to 500mL of a 11.0 M solution to make its concentration 7.0? Which one is it?

300 mL

500 mL

200 mL

400 mL

fe 55.85 g/mol and h2o 18.02 g/mol.

you need to stop taking that class

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.