2. Atoms & Elements

Which of the following pairs represent isotopes?

How many neutrons are in a typical atom of sodium (Na) with an atomic number of 11 and an atomic mass of 23?

Which isotope of sulfur has 16 neutrons?

Which statement about isotopes is correct?

Which statement explains why carbon-14 dating cannot be used to date ancient rocks?

How many neutrons are present in an isotope of selenium-83?

Arsenic has an atomic number of 33 and its most common isotope has a mass number of 75. How many neutrons are present in this isotope of arsenic?

Which of the following best describes the difference in atomic structure between carbon-12 and carbon-14?

How many neutrons does a nitrogen atom typically have if its atomic number is 7 and its most common isotope has a mass number of 14?

Which of the following correctly describes how to calculate the number of neutrons (n) in an atom?

How many protons and neutrons are present in an atom of magnesium-25?

Boron occurs naturally as two isotopes. What is the primary difference between these isotopes?

Which of the following is an example of a radioactive isotope?

Which of the following best explains why carbon-14 is the most common isotope used for radiometric dating of once-living materials?

An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?