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Physics>Atoms & all
terms/questions/names & define/answer/formulas/value
| Term | Definition |
|---|---|
| atomic mass unit (u) | 1/12 th of mass of atom of 6C^12 isotope |
| mass of 6.023 x 10^23 atoms of C^12= | 12g |
| 1u= | 1/12 x 12/6.02x10^23 =1.66x10^-27 kg |
| charge on electron | -1.602x10^-19 C |
| charge on proton | +1.602x10^-19 C |
| mass of electron | 0.00055 u |
| mass of proton | 1.0073 u |
| mass of neutron | 1.0086 u / 1.6749x10^-27 kg |
| A FREE neutron is unstable and has mean life of 1000sec. | neutron is stable inside the nucleus. Free proton is stable. |
| Mass number (A)= | A=atomic no. (Z) + no. of neutrons (N). Z=no. of protons in nucleus |
| Nucleon | proton or neutron. so no. of nucleons= A . |
| Nuclear species or Nuclides are represented as | A X we write AXz. Z |
| isotopes | same Z but different mass number i.e. different no. of neutrons. ex. 2 3 H and H 1 1 |
| isobars | same mass number but different Z. ex. 3 H 1 and 3 He 2 |
| isotones | same N but different Z. ex. 198 Hg 80 and 197 Au 79 |
Created by:
rushikesh pawar
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