GCSE Chemistry Specification

OCR B J258

Section C2.1: How have our ideas about atoms developed over time?

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#C2.1.1

describe how and why the atomic model has changed over time to include the main ideas of Dalton, Thomson, Rutherford and Bohr

#C2.1.2

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

#C2.1.3

recall relative charges and approximate relative masses of protons, neutrons and electrons

#C2.1.4

estimate the size and scale of atoms relative to other particles

#C2.1.5

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

#C2.1.6

relate size and scale of atoms to objects in the physical world

#C2.1.7

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