describe how and why the atomic model has changed over time
the Thomson, Rutherford (alongside Geiger and Marsden) and Bohr models
describe how and why the atomic model has changed over time
the Thomson, Rutherford (alongside Geiger and Marsden) and Bohr models
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 almost all of the mass in the nucleus
recall the typical size (order of magnitude) of atoms and small molecules
knowledge that it is typically 1 × 10–10 m
define density
explain the differences in density between the different states of matter in terms of the arrangements of the atoms and molecules
apply the relationship between density, mass and volume to changes where mass is conserved