2. Atoms & Elements

How many neutrons are present in the isotope lithium-6?

An atom has an atomic number of 6 and a mass number of 14. How many neutrons does this atom have?

When an atom loses a neutron, which of the following best describes the result?

Copper has two naturally occurring isotopes: copper-63 and copper-65. How many neutrons are present in an atom of copper-65?

What is the mass number of an atom of potassium that has 20 neutrons?

Which of the following statements about isotopes is true?

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

An isotope of the element fluorine has 9 protons and 10 neutrons. What is the name of this isotope?

Which of the following represents a pair of isotopes?

Which statement best describes the isotope 12C?

Which element corresponds to a neutral isotope with a mass number of 65 and 36 neutrons?

Which isotope has 14 protons and 15 neutrons?

Which of the following isotopes has the same number of neutrons as phosphorus-31?

If an isotope of lithium contains 5 neutrons, what is its mass number?