Lesson: Atomic Numbers and Mass Numbers Chemistry • 7th Grade

Students will be able to

• define the atomic number and mass number in terms of the nucleus, atom, or ion and isotope,
• interpret nuclide notation to calculate the number of subatomic particles in different atoms, ions, and isotopes,
• use the relationship between an element, the atomic number, and the number of protons in the nuclei to find additional information about an element from the periodic table,
• explain the difference between the average atomic mass and mass number in order to correctly use and describe the numbers on the periodic table.