| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,509,144,439 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
Atomic nucleus |
Also found in: Wikipedia | 0.18 sec. |
|
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. |
|
| Encyclopedia browser | ? | ? Full browser | |||
|---|---|---|---|---|---|
atmospheric pressure ATMP atob atoll atom Atom cluster Atom laser Atom nucleus Atom optics atom smasher atomic Atomic beams atomic bomb Atomic clock atomic energy |
| ||||
| Encyclopedia |
| Free Tools: |
For surfers:
Browser extension |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|