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Nuclear fission – Physics

By |2018-05-31T11:49:26+00:00August 17th, 2017|Physics|

Nuclear fission: Atomic bomb explosions make a "mushroom cloud" Fission reactions are the kind of nuclear reaction we use for nuclear power plants and nuclear submarines, and also to set off a nuclear bomb. With fission reactions, you take very large atoms like uranium and plutonium and smash them apart into smaller atoms. Because it takes a [...]

What is metal? Chemistry

By |2018-04-24T14:46:23+00:00June 2nd, 2017|Chemistry|

Copper ore in Iran Metals are atoms that attach themselves to other atoms in a particular way. Metal atoms, because of how their electrons are arranged, lose their electrons easily. When they join up with other atoms to make molecules, metal atoms join together by exchanging electrons. Because metal atoms join other metal [...]

What is uranium? Atoms, elements, chemistry

By |2018-04-16T23:49:23+00:00June 2nd, 2017|Chemistry, Physics|

Diagram of a uranium atom Uranium is a rare atom, not just on Earth but also in space and on other planets. There is not very much uranium anywhere. That's because, like lead or gold, uranium only forms inside exploding supernovas. Because uranium atoms have so many protons and neutrons in them, they don't [...]

What is a proton? Atoms and Chemistry

By |2018-04-24T14:44:15+00:00June 2nd, 2017|Chemistry, Physics|

Autzen Stadium, in Eugene Oregon, seats 54,000 people A proton is a tiny particle, smaller than an atom. Protons are too small to see, even with an electron microscope, but we know they must be there because that's the only way we can explain how atoms behave. To give you an idea how [...]

What is helium? Atoms, elements, and chemistry

By |2018-04-01T20:58:53+00:00June 2nd, 2017|Chemistry|

Diagram of a helium atom Helium is a very simple atom. Helium is a simple atom. The nucleus of a helium atom has two protons and two neutrons. Around the nucleus, there are two electrons. The only atom simpler than helium is hydrogen. Stars and helium There are helium atoms inside stars. The star [...]

Dominoes – Uranium chain reaction – Chemisty

By |2018-04-16T17:48:32+00:00June 1st, 2017|Chemistry|

You can't really do an experiment using uranium, because it is radioactive and if you experimented with uranium it would make you sick or kill you. So to see how a chain reaction works, let's play with dominoes instead of uranium atoms - that will be safer. A video showing a domino chain reaction Get [...]