Can someone help me with this question please. Explain your reasoning and the reason why you chose your answers. If you don't know how to do it then DON'T attempt at all!

step-by-step explanation:

compare

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.

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.