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What are sub-atomic particles?

short video explaining subatomic particles, elements and compounds. It shows how the atom is composed of sub-atomic particles such as electrons, protons and neutrons and how protons and neutrons are ...

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How do atomic clocks work?

A great short article on how atomic clocks work from NPL

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Robert Hofstadter

Robert Hofstadter (1915 - 1990) developed a new experimental method for the investigation of the inner structure of atomic nuclei. His method was to bombard the atomic nuclei with electrons of very ...

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Laboratory of Atomic and Solid State Physics

A collection of pages from Cornell University concerning atomic and solid state physics.

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Atomic Spectra Databases

The database contains data for transitions and energy levels in atoms and atomic ions, including transitions of 99 elements and energy levels of 51 elements.

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A Diary of Numbers blog

A blog all about bizarre fermi estimations e.g. how many characters you would type if you fell asleep on your keyboard or how many people it would take to hold back a whale

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Atomic Mass Units

What is atomic mass

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hyperphysics

Pauli Exclusion Principle

No two electrons in an atom can have identical quantum numbers. This is an example of a general principle which applies not only to electrons but also to other particles of half-integer spin ...

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Free fall

Simulation of an object being dropped, with speed and time taken to fall from different heights. Velocity and gravity can be varied. Negative numbers for height put the object upwards.

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Isotopes and Radioactivity

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes.

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