2. Atoms & Elements

A lithium atom has an atomic number of 3 and a mass number of 7. How many neutrons are in this lithium atom?

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

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?

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

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

The atomic number of nitrogen is 7. What is the mass number of a nitrogen atom with 6 neutrons?

An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?

How many neutrons are present in a typical lithium atom?

How many protons are present in an atom of potassium-29?

Which of the following statements describes an isotope?

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

How many neutrons does a typical lithium atom have?

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