If the mean is 50 and the standard deviation is 10, what is the probability that a randomly selected item is between 20 and 60? Give your answer as a percent rounded to two decimal places.

john got lost so he didn't know what to do and it was crazy because he didn't except it

step-by-step explanation:

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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.