Math study island ! will mark brainiest.

This is just want I think, so we have 12 feet and 9 feet that form this. We have no other given numbers and on the bottom it says "Figure not on scale" so we don't actually have to worry about that. What i'm thinking is that all you have to do is add 12 + 9. Not sure if i'm actually right so sorry. ^^

step-by-step explanation:

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.