2. Atoms & Elements

How many neutrons are present in the isotope lithium-8?

Astatine-210 is one of the most stable isotopes of astatine. How many neutrons are present in an atom of astatine-210?

How many protons are present in an atom of strontium-90?

What is the mass number of an atom of nitrogen that contains 8 neutrons?

Which of the following is the correct symbol for the carbon isotope that contains seven neutrons?

How many protons, neutrons, and electrons are present in a neutral atom of the isotope represented by 14_6C?

Which of the following best describes a radioactive isotope?

Which of the following is NOT a very long-lived, radioactive isotope?

How many more neutrons are present in an isotope of carbon-14 compared to a standard carbon-12 atom?

In which of the following sets do all species have the same number of protons?

Which element has a mass number of 100 and contains 56 neutrons in its nucleus?

An atom of silver-107 (Ag-107) has an atomic number of 47. How many neutrons does it contain?

Which statement is true regarding the radioactive isotope uranium-235?

Which numbers are typically shown in the symbol for a radioactive nuclide?

Which property of isotopes of the same element must be different?