Please answer. Thanks!

Step-by-step explanation:

So you know the difference is 13. Therefore

x - y = 13

You also know the larger number is 1 less than twice the smaller one. Since 13 is positive, it's safe to assume the first one is larger. So in essence, the larger number (x) is 2 times bigger than the smaller (= 2y...), but one less than that (= 2y - 1)

Therefore

X = 2y - 1

No you can plug in this little expression for x in your original equation:

(2y - 1) - y = 13

And solve for y! Don't forget to distrivute, and to find x, plug the y value you get back into the original (x - y = 13) and solve for x.

Happy calculating! (:

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.