If the natural abundance of Br-79 is 50.69%, what is the natural abundance of Br-81?

An atom of chlorine and an atom of bromine have the same:

What can be inferred about the age of a rock that contains equal amounts of potassium-40 and argon-40?

A sample of chlorine contains two naturally occurring isotopes: chlorine-35 (mass = 34.969 u, abundance = 75.78%) and chlorine-37 (mass = 36.966 u, abundance = 24.22%). What is the average atomic mass of chlorine?

Which of the following statements is correct about the isotope of plutonium with 94 protons and a mass number of 241?

If the mass of Br-81 is 80.9163 amu, which of the following is closest to the mass of Br-79?

How many electrons are present in one atom of the isotope 13C?

An atom of the isotope ¹³C contains how many protons (p), neutrons (n), and electrons (e)?

Which of the following factors directly affects the average atomic mass of an element that exists as a mixture of isotopes?