GCSE Physics Specification

OCR A J249

Section P1.1: The particle model

Are you studying this syllabus?

You can track your progress by adding it to your account.

Add syllabus

#P1.1a

describe how and why the atomic model has changed over time

the Thomson, Rutherford (alongside Geiger and Marsden) and Bohr models

#P1.1b

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

#P1.1c

recall the typical size (order of magnitude) of atoms and small molecules

knowledge that it is typically 1 × 10–10 m

#P1.1d

define density

#P1.1e

explain the differences in density between the different states of matter in terms of the arrangements of the atoms and molecules

#P1.1f

apply the relationship between density, mass and volume to changes where mass is conserved