2. Atoms & Elements

How many neutrons are present in the isotope ruthenium-101 (Ru-101)?

33P is a radioactive isotope of phosphorus. Can 33P be used to make a radioactive nucleotide?

Which element has a mass number of 7 and contains 3 protons?

How many neutrons are present in the isotope molybdenum-96 (Mo-96)?

If a fluorine atom has a mass number of 19, how many neutrons does it contain?

Which subatomic particles contribute to an atom's mass number but not its atomic number?

How many neutrons does a typical lithium atom have?

In which of the following is the number of neutrons correctly represented for the given isotope?

Which of the following represents the iodine isotope that contains 74 neutrons?

An isotope of yttrium has 39 protons and 59 neutrons. What is the mass number of this isotope?

An atom of carbon-14 has an atomic number of 6. How many neutrons does this atom have?

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

Are two atoms of the same element always identical?

How many neutrons does a lithium atom with a mass number of 7 have?

How are isotopes of a given element similar?