Please help me 15 points

See explanation.

Step-by-step explanation:

I can give you a couple to kickstart you...

The ratio of rain to snow in the mountains in a year is, say, 1:2.

The ratio of green and blue in the color turquoise is about 1:1.

Hope that helped,

-sirswagger21

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.