2. Atoms & Elements

Which of the following is closest to the natural abundance of the isotope Br-79?

Which statement correctly describes the behavior of triply charged uranium-235 and uranium-238 ions in a mass spectrometer?

Which of the following are the stable isotopes of carbon?

Which element is commonly used in the radiometric dating of fossils?

Which of the following pairs represent isotopes?

How many neutrons are present in an atom of thorium-234?

A potassium atom has a mass number of 37. What is the number of neutrons in this atom?

How many neutrons does a typical sodium (Na) atom have, given that its atomic number is 11 and its most common isotope has a mass number of 23?

Which of the following best explains how one isotope of an element differs from another?

How are isotopes of an element different from each other?

Deuterium is an isotope of hydrogen with a mass number of 2. Which of the following correctly describes a deuterium atom?

How many protons and neutrons are present in the isotope Cl-37?

Which term describes different forms of an element that have the same number of protons but different numbers of neutrons?

How many protons (p) and neutrons (n) are present in an atom of calcium-46?

How many electrons are present in a neutral atom of the isotope silicon-29?