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

Element M has two naturally occurring isotopes: M-24 (abundance: 78.99%, mass: 23.985 amu) and M-25 (abundance: 21.01%, mass: 24.986 amu). What is the average atomic mass (in amu) of element M?

Which of the following numerical setups can be used to calculate the atomic mass of silver, given that silver has two naturally occurring isotopes: Ag-107 (abundance: 51.8%, mass: 106.905 amu) and Ag-109 (abundance: 48.2%, mass: 108.905 amu)?

Which of the following numerical setups can be used to calculate the atomic mass of the element bromine, given that bromine has two isotopes: Br-79 (abundance 50.69%, mass 78.918 amu) and Br-81 (abundance 49.31%, mass 80.916 amu)?

Which of the following elements has an atomic mass closest to 131.3?

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?

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