Shows how the atomic number is determined by the number of protons and that the periodic table is arranged by increasing atomic number. Also goes into mass number, showing examples that help illustrate that the mass number is the sum of the protons and neutrons.
BasicStudents matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient)Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
AdvancedStudents matched to this level are ready for material that requires superior performance and mastery.