Dan has answered 68% of the questions on the Health quiz. He answered 34 questions. How many questions are on the quiz?

There are 50 questions on the quiz.

34 questions divided by 0.68, because 0.68 is 68 percent in decimal form, therefore equals 50 questions.

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.