| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,733,643,897 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
atomic nucleus |
Also found in: Wikipedia | 0.02 sec. |
|
atomic nucleus [ə′täm·ik ′nü·klē·əs] (astronomy) Atomic nucleus The central region of an atom. Atoms are composed of negatively charged electrons, positively charged protons, and electrically neutral neutrons. The protons and neutrons (collectively known as nucleons) are located in a small central region known as the nucleus. The electrons move in orbits which are large in comparison with the dimensions of the nucleus itself. Protons and neutrons possess approximately equal masses, each roughly 1840 times that of an electron. The number of nucleons in a nucleus is given by the mass number A and the number of protons by the atomic number Z. Nuclear radii r are given approximately by r = 1.2 × 10-15 m A1/3. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in | ? References in periodicals archive | ||
|---|---|---|---|
| Then, high pressure from the wave crushes the orb to an enormous density, and temperature that fuse some atomic nuclei of the bubble's gas. Astrophysicists don't know where the particles come from but believe they are atomic nuclei accelerated by violent magnetic activity somewhere beyond our galaxy. This garbage is radioactive (emits deadly high-energy rays); it's generated by the nation's 104 nuclear power stations, which harness energy from the breakdown of atomic nuclei to create electricity. |
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|