2. Atoms & Elements

How many neutrons are present in the most common isotope of potassium (K-39)?

Which subatomic particle determines the identity of an element?

Which of the following statements best describes isotopes?

How many neutrons does a sodium (Na) atom typically have?

How many neutrons are in the nucleus of a potassium atom with a mass number of 39?

What is the mass number for lithium?

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

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

How many neutrons are present in an atom of potassium-39?

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

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have?

How many neutrons does a lithium (Li) atom typically have?

Why did Hershey and Chase use the isotopes 32P and 35S in their experiments?