The blue dot is at what value on the number line please help me

3

Step-by-step explanation:

Hi there! I'm glad I was able to help you with this problem!

On a number line, the left side decreases in numbers, while the right side increases. Therefore, with the number 7 already given to us on the line, the blue dot is on the third point. All you have to do is count backwards to get your answer. :)

I hope this helped you! Comment below if you have any other questions!

3

Step-by-step explanation:

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.