describe how and why the atomic model has changed over time to include the main ideas of Dalton, Thomson, Rutherford and Bohr
describe how and why the atomic model has changed over time to include the main ideas of Dalton, Thomson, Rutherford and Bohr
describe the atom as a positively charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with most of the mass in the nucleus
recall relative charges and approximate relative masses of protons, neutrons and electrons
estimate the size and scale of atoms relative to other particles
recall the typical size (order of magnitude) of atoms and small molecules
relate size and scale of atoms to objects in the physical world
calculate numbers of protons, neutrons and electrons in atoms, given atomic number and mass number of isotopes or by extracting data from the Periodic Table