Name the property user in each step
2.75+3.5+4.25+1.5

I'm not sure what the "user" part means, and properties in math are general rules that are used in calculations.

If you need the property for each step, it is the commutative property of addition for every step, because it is all addition. (The commutative property of addition states that no matter the order in which numbers are added, they combine to the same result.)

If you mean something else, let me know.

step-by-step explanation:

4227473658779875563886538705958641728563470543621287463824132573847969p05749365273847906970680574936214

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.