A 550-L cylinder contains 672.48 g of nitrogen gas at 147 degrees Celsius. The maximum pressure that the cylinder can withstand is 1310 mmHg. How many grams of helium must be added to the cylinder to reach its maximum allowed pressure?

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.