Hello, could you help me with this exercise if possible with the explanations please
What fraction is the coloured part?
thank you

1/4

Step-by-step explanation:

the square is divided into 4 pieces and only one of them is shaded  

what i would say the best answer is a. 40.5

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.