The student made a mistake on his diagram. Which mistake did he make? A
Ultraviolet light is used to communicate information through space.
B
Radio waves are used by food companies to sterilize produce.
Gamma waves are used in medicine to shrink problem cells.
D
Infrared radiation is used to create energy in nuclear reactors.

it’s gamma rays are used for medicine to shrink problem cells

Explanation:

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.