Please help!! A balloon contains 7 L of He. The pressure is reduced to 2 atm and the
balloon expands to occupy a volume of 25 L. What was the initial pressure
exerted on the balloon? (round to the nearest whole number)

answer7,570,82356 cubic centimeters;

0.88m hope i am correct : )

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.