Which element in the nonmetal halogen family has an atomic mass closest to 35?

Which of the following best describes what the whole numbers on the periodic table represent?

Which nonmetallic element in period 3 of the periodic table has an atomic mass closest to 32?

Given the following atoms and their atomic masses: Hydrogen (1.008 u), Carbon (12.01 u), Oxygen (16.00 u), and Iron (55.85 u), which atom has the highest atomic mass?

Which element has a higher atomic mass: cadmium or zinc?

An atom's atomic mass is best described as the mass of:

What is the mass number of an ion that has 105 electrons, 157 neutrons, and a +1 charge?

Which of the following best describes how to calculate the average atomic mass of an element?

Which of the following elements has an atomic mass of 106.42?