Alpha particles come from the nucleus of a radioactive atom. They consist of 2 protons and 2 neutrons; hence have a 2+ charge. A few centimeters of air will stop them. Alpha radiation consists of ...

As part of an experiment with x-rays in 1909, Rutherford was shooting a beam of alpha particles (or alpha rays ... in a central nucleus about 10,000 times smaller than the atom itself.

The change that an unstable nucleus undergoes is called disintegration or decay. When unstable nuclei disintegrate or decay, certain particles - alpha or beta particles - or bundles of energy called ...

When researchers blasted lead-208 with ions to excite the subatomic particles and determine the shape of the nucleus, they found that it was instead sort of oblong, as if it had been squashed.

When radioactive materials emit radiation, not only does it not glow green, it does not glow at all. Ionising radiation, ...

Between 1914 and 1919 Rutherford conducted many experiments at the University by bombarding nitrogen gas with alpha particles. These experiments indicated that penetrating radiation was emitted that ...

In beta decay, a proton or neutron in a nucleus emits a beta particle (an ... and directions of the emitted beta particle and two alpha particles with high precision. This approach allowed the ...

JON CHASE:'If the radioactivity involves particles leaving the nucleus, 'the atom will have ... There are three main types - alpha, beta or gamma. JON CHASE:'Gamma radiation is pure energy ...