Atomic Structure and Subatomic Particles — OCR GCSE Combined Science B J260
OCR GCSE Combined Science B · J260
Atomic Structure and Subatomic Particles
What you need to know
Describe how and why the atomic model has evolved over time, detailing the key contributions of Dalton, Thomson, Rutherford, and Bohr.
Describe the atom as a positively charged nucleus containing most of the mass, surrounded by negatively charged electrons, and note that the nuclear radius is significantly smaller than the overall atomic radius.
Recall the relative charges and approximate relative masses of protons, neutrons, and electrons.
Estimate and relate the size and scale of atoms to other particles and everyday physical objects.
Recall the typical order of magnitude for the spatial size of atoms and small molecules.
Calculate the number of protons, neutrons, and electrons in atoms or isotopes using the atomic number and mass number derived from the Periodic Table.
