What is the percent by mass of magnesium sulfate in mgso4  ·  7h2o? use  .12.04%48.83%51.17%86.98%

48.83%

Explanation: Mass percent is the ratio of mass of the particular substance  to the total mass of given compound.

Mass of = 120g

Mass of = 246g

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.