C1 Atomic structure
Atoms
Mixtures
The development of the model of the atom
Relative electrical charges of subatomic particles
Size and mass of atoms
Relative atomic mass
Electronic structure
definition
describe, explain and give examples of the specified processes of separation
filtration
crystallisation
simple distillation
fractional distillation
chromatography
Before the discovery of the electron
After the discovery of the electron
Plum pudding model
alpha particle scattering experiment
Niels Bohr
discovery of the proton
James Chadwick
proton
neutron
electron
Atoms are very small, having a radius of about 0.1 nm (1 x 10-10 m)
The radius of a nucleus is less than 1/10 000 of that of the atom (about 1 x 10-14 m)
Relative mass
electron
proton
neutron
Atomic number and mass number
isotopes
definition
calculating the relative atomic mass of an
element given the percentage abundance of its isotopes
The electrons in an atom occupy the lowest available energy levels (innermost available shells)
Elements
Compounds