All the rocks shown below were formed as high amounts of pressure caused other types of rock to change form.
Which type of rock is shown in the image?

A. Sedimentary
B. Extrusive igneous
C. Metamorphic
D. Instrusive igneous

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.