Arandom sample was taken to determine whether students from a certain classroom prefer to shop at store a, store b, or store c. which of the following would represent a random sample?
selecting all the students that have a last name that begins with r
selecting all the girls
putting all the names in a hat and selecting six students
putting all the names in alphabetical order and selecting every fourth student

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.