Alpha particles are made of 2 protons and 2 neutrons released from a nucleus when it breaks apart
States of matter are the different forms we find elements, compounds and mixtures in the periodic table as solids liquids and gases.
The work of J.J Thomson’s student, Ernest Rutherford, led to the discovery of the Proton. Working with alpha particles fired at a piece of gold foil it was observed that instead of passing straight through it was scattered. Suggesting there was something large in the centre of the atom.