2. Atoms & Elements

Which of the following best describes the difference between mass number and atomic mass?

Which of the following is the number of protons in a chlorine atom?

Approximately how many times heavier is a helium (He) atom compared to a hydrogen (H) atom?

Which of the following elements has the greatest atomic mass?

Chlorine has an atomic number of 17 and contains 18 neutrons. What is its mass number?

Which of the following is closest to the atomic mass of lithium?

Which of the following is the atomic mass of fluorine?

Which of the following elements has the lowest atomic mass?

What is the atomic number for potassium?

Which of the following is closest to the atomic mass of calcium (Ca)?

Which term is defined as the sum of protons and neutrons in an atom?

An atom has 20 electrons and 20 neutrons. What is the atomic mass of this atom if it also has 20 protons?

How many protons are present in the isotope lithium-7?

Which of the following is closest to the atomic mass of phosphorus (P)?

Which of the following is closest to the atomic mass of nickel (Ni)?