Europa2433 deleted my question: the reason~ We're all about challenging our users to push their intellectual boundaries. Your question, while much appreciated, seems just a bit too simple for the site. wth 5*5*4*3=answer if u want to :)

freee points i guess thank very much

Step-by-step explanation:

300

Explain:

5*5= 25*4= 100*3= 300

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.