C1 Atomic models

What is Daltons model of the atom

Atoms as a solid spheres that could not be divided into smaller parts

What is the plum pudding

A ball of positive charge with electrons embedded in it

What did the alpha scattering experiment help discover

That there is a centre of a positive charge and the mass in concentrated there , nucleus

Describe the nuclear model

Dense nucleus with the electrons orbiting it, not at fixed levels

What did niels bohr discover

Electrons orbit in fixed energy levels (shells)

What did chadwick discover

The neutron

What is the relative atomic mass of each subatomic particle

Proton: 1 neutron: 1 electron: 0

What is relative mass

The average mass of all the atoms of an element